XML 39 R28.htm IDEA: XBRL DOCUMENT
v3.26.1

Intangible Assets (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at March 31, 2026 and December 31, 2025 allocated by domestic and foreign operations is as follows (in millions):
| Brokerage |  | Risk Management |  | Corporate |  | Total
At March 31, 2026 |  |  |  |  |  |  |
United States | $ | 15,668 |  |  | $ | 109 |  |  | $ | — |  |  | $ | 15,777 |
United Kingdom | 3,468 |  |  | 139 |  |  | — |  |  | 3,607 |
Canada | 624 |  |  | — |  |  | — |  |  | 624 |
Australia | 632 |  |  | 247 |  |  | — |  |  | 879 |
New Zealand | 225 |  |  | 9 |  |  | — |  |  | 234 |
Other foreign | 1,807 |  |  | 13 |  |  | 17 |  |  | 1,837 |
Total goodwill | $ | 22,424 |  |  | $ | 517 |  |  | $ | 17 |  |  | $ | 22,958 |
At December 31, 2025 |  |  |  |  |  |  |
United States | $ | 16,428 |  |  | $ | 109 |  |  | $ | — |  |  | $ | 16,537 |
United Kingdom | 2,889 |  |  | 142 |  |  | — |  |  | 3,031 |
Canada | 628 |  |  | — |  |  | — |  |  | 628 |
Australia | 591 |  |  | 238 |  |  | — |  |  | 829 |
New Zealand | 225 |  |  | 8 |  |  | — |  |  | 233 |
Other foreign | 1,317 |  |  | — |  |  | 18 |  |  | 1,335 |
Total goodwill | $ | 22,078 |  |  | $ | 497 |  |  | $ | 18 |  |  | $ | 22,593 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three-month period ended March 31, 2026 are as follows (in millions):
| Brokerage |  | Risk Management |  | Corporate |  | Total
Balance as of December 31, 2025 | $ | 22,078 |  |  | $ | 497 |  |  | $ | 18 |  |  | $ | 22,593 |
Goodwill acquired during the period | 188 |  |  | 13 |  |  | — |  |  | 201 |
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) | 180 |  |  | (1) |  |  | — |  |  | 179 |
Foreign currency translation adjustments during the period | (22) |  |  | 8 |  |  | (1) |  |  | (15) |
Balance as of March 31, 2026 | $ | 22,424 |  |  | $ | 517 |  |  | $ | 17 |  |  | $ | 22,958 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at March 31, 2026 and December 31, 2025 consist of the following (in millions):
| March 31, 2026 |  | December 31, 2025
Expiration lists | $ | 15,840 |  |  | $ | 15,968 |
Accumulated amortization - expiration lists | (5,556) |  |  | (5,357) |
| 10,284 |  |  | 10,611 |
Non-compete agreements | 138 |  |  | 125 |
Accumulated amortization - non-compete agreements | (102) |  |  | (98) |
| 36 |  |  | 27 |
Trade names | 103 |  |  | 160 |
Accumulated amortization - trade names | (57) |  |  | (114) |
| 46 |  |  | 46 |
Net amortizable assets | $ | 10,366 |  |  | $ | 10,684 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):
2026 (remaining nine months) | $ | 831 |
2027 | 1,080 |
2028 | 1,037 |
2029 | 978 |
2030 | 920 |
Thereafter | 5,520 |
Total | $ | 10,366 |

X
- Definition Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations + References No definition available. + Details
Name: | ajg_CarryingAmountOfGoodwillAllocatedByDomesticAndForeignOperationsTableTextBlock
Namespace Prefix: | ajg_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of amortization expense of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
Name: | us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 + Details
Name: | us-gaap_ScheduleOfGoodwillTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration