Fundies. English
Segment disclosures
Company overviewARTHUR J. GALLAGHER & CO.
Each reported dimension combination stays separate. Revenue and operating income are shown as reported, with their dates and sources.
Revenue · Reported segment facts
88 dimension combinations 771 retained observations 19 reported periods Partial retained history
Counts describe retained dimensioned rows only. Periods and members can change across reports, and this view does not infer missing values or expected segment totals.
Operating Segments · Other Foreign · Brokerage Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=ajg:OtherForeignMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 381000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 300000000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 253300000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 572600000 | USD | 20240209 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 190500000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 450900000 | USD | 20240209 | Open filing evidence |
Operating Segments · Other Foreign · Risk Management Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=ajg:OtherForeignMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 4000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 1000000 Restated | USD | 20260507 | Open filing evidence |
Operating Segments · Other Foreign · Corporate
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=ajg:OtherForeignMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
Operating Segments · AU · Brokerage Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:AU;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 79000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 69000000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 68000000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 312100000 | USD | 20240209 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 79800000 | USD | 20231027 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 227800000 | USD | 20231027 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 83800000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 148000000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 64200000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 281800000 | USD | 20240209 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 71800000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 207400000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 76600000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 135600000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 59000000 | USD | 20230508 | Open filing evidence |
Operating Segments · AU · Risk Management Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:AU;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 67000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 56000000 Restated | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 225800000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 58200000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 167200000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 56000000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 109000000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 53000000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 154700000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 38500000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 110000000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 37500000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 71500000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 34000000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 129100000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 31200000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 97200000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 34300000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 66000000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 31700000 | USD | 20230508 | Open filing evidence |
Operating Segments · AU · Corporate
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:AU;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
Operating Segments · CA · Brokerage Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:CA;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 91000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 99000000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 103100000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 397700000 | USD | 20240209 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 93700000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 356000000 | USD | 20240209 | Open filing evidence |
Operating Segments · CA · Risk Management Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:CA;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 2000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 2000000 | USD | 20260507 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 6200000 | USD | 20240209 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1800000 | USD | 20231027 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 4800000 | USD | 20231027 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 1500000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 3000000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 1500000 | USD | 20230508 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5900000 | USD | 20240209 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 1700000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 4500000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 1400000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 2800000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 1400000 | USD | 20230508 | Open filing evidence |
Operating Segments · CA · Corporate
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:CA;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
Operating Segments · GB · Brokerage Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:GB;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 745000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 675000000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 584800000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1946500000 | USD | 20240209 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 513500000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1544300000 | USD | 20240209 | Open filing evidence |
Operating Segments · GB · Risk Management Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:GB;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 30000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 22000000 Restated | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 57000000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 15700000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 43700000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 14000000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 28000000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 14000000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 47600000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 11900000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 34800000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 11600000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 22900000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 11300000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 44100000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 10900000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 34400000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 12500000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 23500000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 11000000 | USD | 20230508 | Open filing evidence |
Operating Segments · GB · Corporate
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:GB;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
Operating Segments · NZ · Brokerage Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:NZ;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 42000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 40000000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 41700000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 192200000 | USD | 20240209 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 49600000 | USD | 20231027 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 140600000 | USD | 20231027 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 91000000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 38000000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 166900000 | USD | 20240209 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 41300000 | USD | 20221102 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 47200000 | USD | 20220803 | Open filing evidence |
Operating Segments · NZ · Risk Management Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:NZ;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 Restated | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 7400000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1900000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 6200000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 2100000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 4300000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 2200000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 15800000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 4000000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 12200000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 4300000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 8200000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 3900000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 14400000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 3300000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 10400000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 3600000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 7100000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 3500000 | USD | 20230508 | Open filing evidence |
Operating Segments · NZ · Corporate
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:NZ;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
Operating Segments · US · Brokerage Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:US;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 2955000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 2131000000 | USD | 20260507 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 1475300000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 4503900000 | USD | 20240209 | Open filing evidence |
Operating Segments · US · Risk Management Segment
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:US;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 367000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 332000000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1307700000 | USD | 20250218 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 977300000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 324200000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 320500000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1208700000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 313200000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 892000000 | USD | 20231027 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 298700000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 578800000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 280100000 | USD | 20230508 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1029600000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 260400000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 752900000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 250200000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 492500000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 242300000 | USD | 20230508 | Open filing evidence |
Operating Segments · US · Corporate
Consolidation Items · Statement Geographical · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:US;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | -5000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 400000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1700000 | USD | 20240209 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 500000 | USD | 20231027 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 500000 | USD | 20231027 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | -100000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 100000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 23700000 | USD | 20240209 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 300000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 23400000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 300000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 23100000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 22800000 | USD | 20230508 | Open filing evidence |
Operating Segments · Brokerage Segment
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 3502000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 7795000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 4293000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 12192000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2922900000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 9023100000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2787000000 Restated | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 6101000000 Restated | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 3314000000 Restated | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 9934000000 Restated | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 2396400000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 7637600000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 2376300000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 5241200000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 2864900000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 8637000000 Restated | USD | 20260217 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 2122100000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 6585700000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 2088400000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 4463600000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 2375200000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 7303800000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 1736200000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 5599500000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 1740700000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 3863300000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 2122600000 | USD | 20230508 | Open filing evidence |
Operating Segments · Brokerage Segment · Other Foreign
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=ajg:OtherForeignMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 300500000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 700800000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 141900000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 545200000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 150000000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 403300000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 253300000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 572600000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 126600000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 436800000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 119700000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 310200000 | USD | 20240726 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 450900000 | USD | 20250218 | Open filing evidence |
Operating Segments · Brokerage Segment · AU
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:AU| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 68600000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 348800000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 93800000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 252700000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 90900000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 158900000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 68000000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 312100000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 79800000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 227800000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 83800000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 148000000 | USD | 20240726 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 281800000 | USD | 20250218 | Open filing evidence |
Operating Segments · Brokerage Segment · CA
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:CA| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 99000000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 409100000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 93700000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 307100000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 110300000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 213400000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 103100000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 397700000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 89800000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 288100000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 104600000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 198300000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 93700000 | USD | 20230508 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 356000000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 80600000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 261900000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 93800000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 181300000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 87500000 | USD | 20230508 | Open filing evidence |
Operating Segments · Brokerage Segment · GB
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:GB| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 675500000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 2168400000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 497200000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1656600000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 574600000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 1159400000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 584800000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1946500000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 427300000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1468400000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 527600000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 1041100000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 513500000 | USD | 20230508 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1544300000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 315700000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 1182100000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 426200000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 866400000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 440200000 | USD | 20230508 | Open filing evidence |
Operating Segments · Brokerage Segment · NZ
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:NZ| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 39800000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 202800000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 53200000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 150800000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 55900000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 97600000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 41700000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 192200000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 49600000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 140600000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 53000000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 91000000 | USD | 20240726 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 166900000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 41300000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 122900000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 47200000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 81600000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 34400000 | USD | 20230508 | Open filing evidence |
Operating Segments · Brokerage Segment · US
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:US| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 2131200000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 6103900000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1516600000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 4725200000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1394600000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3208600000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 1814000000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 5216100000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1349000000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 4024000000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 1199700000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 2675000000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 1475300000 | USD | 20230508 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 4503900000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 1140300000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 3492000000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 1015000000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 2351700000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 1336700000 | USD | 20230508 | Open filing evidence |
Operating Segments · Risk Management Segment
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 501000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 971000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 470000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1749000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 442300000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1289500000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 435000000 Restated | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 848000000 Restated | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 413000000 Restated | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1605000000 Restated | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 410000000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1199400000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 398000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 789400000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 391400000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1433000000 | USD | 20260217 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 369400000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1053800000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 353600000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 684400000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 330800000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1223100000 | USD | 20250218 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 307500000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 899400000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 302000000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 591900000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 289900000 | USD | 20230508 | Open filing evidence |
Operating Segments · Risk Management Segment · AU
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:AU| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 53000000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 129100000 | USD | 20240209 | Open filing evidence |
Operating Segments · Risk Management Segment · CA
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:CA| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 1800000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 6900000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1600000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 5000000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1700000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3400000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 1700000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 6200000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1800000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 4800000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 1500000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 3000000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 1500000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5900000 | USD | 20250218 | Open filing evidence |
Operating Segments · Risk Management Segment · US
Consolidation Items · Statement Business Segments · Statement Geographical
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:US| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 331800000 | USD | 20250502 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 332600000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 644700000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 320500000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1208700000 | USD | 20240209 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 892000000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 298700000 | USD | 20240726 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 280100000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1029600000 | USD | 20240209 | Open filing evidence |
Operating Segments · Corporate
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | -5000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | -5000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 400000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1200000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 Restated | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 Restated | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 16000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 400000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1900000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1100000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 1500000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 400000 | USD | 20240501 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 2000000 Restated | USD | 20260217 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 500000 | USD | 20231027 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 500000 | USD | 20231027 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | -100000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 100000 | USD | 20240501 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 23700000 | USD | 20240209 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 300000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 23400000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 300000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 23100000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 22800000 | USD | 20230508 | Open filing evidence |
Other Foreign · Operating Segments · Brokerage Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=ajg:OtherForeignMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 879000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 185200000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 665300000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 179600000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 480100000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 701000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 141900000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 545200000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 150000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 403300000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 573000000 | USD | 20260217 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 126600000 | USD | 20231027 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 436800000 | USD | 20231027 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 119700000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 310200000 | USD | 20230804 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 190500000 | USD | 20230508 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 450900000 | USD | 20230210 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 86500000 | USD | 20231027 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 333200000 | USD | 20231027 | Open filing evidence |
| 2022-04-01 – 2022-06-30 | 81900000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-06-30 | 246700000 | USD | 20230804 | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 164800000 | USD | 20230508 | Open filing evidence |
Other Foreign · Operating Segments · Risk Management Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=ajg:OtherForeignMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 7000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1900000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 5100000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 3200000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260217 | Open filing evidence |
Other Foreign · Operating Segments · Corporate
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=ajg:OtherForeignMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260217 | Open filing evidence |
Other Foreign · Brokerage Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=ajg:OtherForeignMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 238000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 619000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 180000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 480000000 | USD | 20260805 | Open filing evidence |
Other Foreign · Risk Management Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=ajg:OtherForeignMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 4000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 8000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 3000000 | USD | 20260805 | Open filing evidence |
Other Foreign · Corporate · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=ajg:OtherForeignMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
AU · Operating Segments · Brokerage Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:AU;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 344000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 89600000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 254800000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 96600000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 165200000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 349000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 93800000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 252700000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 90900000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 158900000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 312000000 | USD | 20260217 | Open filing evidence |
AU · Operating Segments · Risk Management Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:AU;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 242000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 61600000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 176700000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 58900000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 115100000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 226000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 58200000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 167200000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 56000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 109000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 155000000 | USD | 20260217 | Open filing evidence |
AU · Operating Segments · Corporate
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:AU;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260217 | Open filing evidence |
AU · Brokerage Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:AU;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 111000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 190000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 97000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 166000000 | USD | 20260805 | Open filing evidence |
AU · Risk Management Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:AU;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 71000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 138000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 59000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 115000000 | USD | 20260805 | Open filing evidence |
AU · Corporate · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:AU;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
CA · Operating Segments · Brokerage Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:CA;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 387000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 88000000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 291500000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 104500000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 203500000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 409000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 93700000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 307100000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 110300000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 213400000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 398000000 | USD | 20260217 | Open filing evidence |
CA · Operating Segments · Risk Management Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:CA;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 8000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2000000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 5700000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1900000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 3700000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 7000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1600000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 5000000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1700000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3400000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 6000000 | USD | 20260217 | Open filing evidence |
CA · Operating Segments · Corporate
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:CA;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260217 | Open filing evidence |
CA · Brokerage Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:CA;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 102000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 193000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 105000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 204000000 | USD | 20260805 | Open filing evidence |
CA · Risk Management Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:CA;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 3000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 5000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 4000000 | USD | 20260805 | Open filing evidence |
CA · Corporate · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:CA;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
GB · Operating Segments · Brokerage Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:GB;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 2372000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 484500000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1803000000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 643000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1318500000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 2168000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 497200000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1656600000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 574600000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 1159400000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1946000000 | USD | 20260217 | Open filing evidence |
GB · Operating Segments · Risk Management Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:GB;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 105000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 28000000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 77400000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 28100000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 49400000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 57000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 15700000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 43700000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 14000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 28000000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 47000000 | USD | 20260217 | Open filing evidence |
GB · Operating Segments · Corporate
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:GB;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260217 | Open filing evidence |
GB · Brokerage Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:GB;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 686000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 1431000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 643000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 1318000000 | USD | 20260805 | Open filing evidence |
GB · Risk Management Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:GB;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 30000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 60000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 28000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 50000000 | USD | 20260805 | Open filing evidence |
GB · Corporate · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:GB;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
NZ · Operating Segments · Brokerage Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:NZ;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 207000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 54600000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 152000000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 57600000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 97400000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 203000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 53200000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 150800000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 55900000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 97600000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 192000000 | USD | 20260217 | Open filing evidence |
NZ · Operating Segments · Risk Management Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:NZ;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 200000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 100000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 200000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 7000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1900000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 6200000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 2100000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 4300000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 16000000 | USD | 20260217 | Open filing evidence |
NZ · Operating Segments · Corporate
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:NZ;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260217 | Open filing evidence |
NZ · Brokerage Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:NZ;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 60000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 102000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 58000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 98000000 | USD | 20260805 | Open filing evidence |
NZ · Risk Management Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:NZ;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
NZ · Corporate · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:NZ;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
US · Operating Segments · Brokerage Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:US;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 8003000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2021000000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 5856500000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1704300000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 3835500000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 6104000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1516600000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 4725200000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1394600000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3208600000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 5216000000 | USD | 20260217 | Open filing evidence |
US · Operating Segments · Risk Management Segment
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:US;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 1387000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 348800000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1024400000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 343900000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 675700000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1308000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 332600000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 977300000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 324200000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 644700000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1209000000 | USD | 20260217 | Open filing evidence |
US · Operating Segments · Corporate
Statement Geographical · Consolidation Items · Statement Business Segments
Source dimensions
srt:StatementGeographicalAxis=country:US;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 1000000 | USD | 20260217 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 400000 | USD | 20251110 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1200000 | USD | 20251110 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 400000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 800000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 16000000 | USD | 20260217 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 400000 | USD | 20251110 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1900000 | USD | 20251110 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1100000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 1500000 | USD | 2025-08-01 · 22:43:20.000Z | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 2000000 | USD | 20260217 | Open filing evidence |
US · Brokerage Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:US;us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 2305000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 5260000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1704000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 3835000000 | USD | 20260805 | Open filing evidence |
US · Risk Management Segment · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:US;us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 393000000 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 760000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 344000000 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 676000000 | USD | 20260805 | Open filing evidence |
US · Corporate · Operating Segments
Statement Geographical · Statement Business Segments · Consolidation Items
Source dimensions
srt:StatementGeographicalAxis=country:US;us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | -5000000 | USD | 20260805 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260805 | Open filing evidence |
Brokerage Segment · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 3473000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 11268000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2922000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 9023000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Brokerage Segment · Other Foreign · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=ajg:OtherForeignMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 261000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 880000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 185000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 665000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 164800000 | USD | 20220506 | Open filing evidence |
Brokerage Segment · AU · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:AU;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 102000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 292000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 89000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 255000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 59000000 | USD | 20220506 | Open filing evidence |
Brokerage Segment · CA · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:CA;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 104000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 297000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 88000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 292000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 87500000 | USD | 20220506 | Open filing evidence |
Brokerage Segment · GB · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:GB;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 529000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1960000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 485000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1803000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 440200000 | USD | 20220506 | Open filing evidence |
Brokerage Segment · NZ · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:NZ;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 55000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 157000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 54000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 152000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 34400000 | USD | 20220506 | Open filing evidence |
Brokerage Segment · US · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:BrokerageSegmentMember;srt:StatementGeographicalAxis=country:US;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 2422000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 7682000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2021000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 5856000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 1336700000 | USD | 20220506 | Open filing evidence |
Risk Management Segment · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 503000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1474000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 442000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1290000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Risk Management Segment · Other Foreign · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=ajg:OtherForeignMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 5000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 13000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 5000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Risk Management Segment · AU · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:AU;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 75000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 213000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 62000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 177000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 31700000 | USD | 20220506 | Open filing evidence |
Risk Management Segment · CA · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:CA;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 2000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 7000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 6000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 1400000 | USD | 20220506 | Open filing evidence |
Risk Management Segment · GB · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:GB;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 31000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 91000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 27000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 77000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 11000000 | USD | 20220506 | Open filing evidence |
Risk Management Segment · NZ · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:NZ;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2022-01-01 – 2022-03-31 | 3500000 | USD | 20220506 | Open filing evidence |
Risk Management Segment · US · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=ajg:RiskManagementSegmentMember;srt:StatementGeographicalAxis=country:US;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 390000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 1150000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 349000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1025000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Corporate · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | -5000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 400000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 16300000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 400000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1900000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1100000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 1500000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 400000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1700000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 500000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 500000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | -100000 | USD | 20240726 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 23700000 | USD | 20250218 | Open filing evidence |
Corporate · Operating Segments · US
Statement Business Segments · Consolidation Items · Statement Geographical
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:StatementGeographicalAxis=country:US| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-03-31 | 400000 | USD | 20250502 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 16300000 | USD | 20250218 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 400000 | USD | 20241029 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 1900000 | USD | 20241029 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1100000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 1500000 | USD | 20240726 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 400000 | USD | 20250502 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1700000 | USD | 20250218 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 500000 | USD | 20241029 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 500000 | USD | 20241029 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | -100000 | USD | 20240726 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 23700000 | USD | 20250218 | Open filing evidence |
Corporate · Other Foreign · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:StatementGeographicalAxis=ajg:OtherForeignMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Corporate · AU · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:StatementGeographicalAxis=country:AU;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Corporate · CA · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:StatementGeographicalAxis=country:CA;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Corporate · GB · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:StatementGeographicalAxis=country:GB;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Corporate · NZ · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:StatementGeographicalAxis=country:NZ;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
Corporate · US · Operating Segments
Statement Business Segments · Statement Geographical · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:CorporateMember;srt:StatementGeographicalAxis=country:US;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-07-01 – 2026-09-30 | 0 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2026-01-01 – 2026-09-30 | -5000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 1000000 | USD | 2026-11-05 · 13:47:29.000Z | Open filing evidence |