XML 36 R29.htm IDEA: XBRL DOCUMENT
v3.25.1

Intangible Assets (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at March 31, 2025 and December 31, 2024 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At March 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 7,069.1 |  |  | $ | 74.8 |  |  | $ | — |  |  | $ | 7,143.9 |
United Kingdom |  |  | 2,671.6 |  |  |  | 114.3 |  |  |  | — |  |  |  | 2,785.9 |
Canada |  |  | 604.6 |  |  |  | — |  |  |  | — |  |  |  | 604.6 |
Australia |  |  | 523.0 |  |  |  | 221.4 |  |  |  | — |  |  |  | 744.4 |
New Zealand |  |  | 193.8 |  |  |  | 8.7 |  |  |  | — |  |  |  | 202.5 |
Other foreign |  |  | 1,214.9 |  |  |  | — |  |  |  | 18.5 |  |  |  | 1,233.4 |
Total goodwill |  | $ | 12,277.0 |  |  | $ | 419.2 |  |  | $ | 18.5 |  |  | $ | 12,714.7 |
At December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 6,965.6 |  |  | $ | 74.8 |  |  | $ | — |  |  | $ | 7,040.4 |
United Kingdom |  |  | 2,591.4 |  |  |  | 25.7 |  |  |  | — |  |  |  | 2,617.1 |
Canada |  |  | 586.9 |  |  |  | — |  |  |  | — |  |  |  | 586.9 |
Australia |  |  | 509.1 |  |  |  | 219.3 |  |  |  | — |  |  |  | 728.4 |
New Zealand |  |  | 183.2 |  |  |  | 8.5 |  |  |  | — |  |  |  | 191.7 |
Other foreign |  |  | 1,087.2 |  |  |  | — |  |  |  | 18.5 |  |  |  | 1,105.7 |
Total goodwill |  | $ | 11,923.4 |  |  | $ | 328.3 |  |  | $ | 18.5 |  |  | $ | 12,270.2 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three-month period ended March 31, 2025 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2024 |  | $ | 11,923.4 |  |  | $ | 328.3 |  |  | $ | 18.5 |  |  | $ | 12,270.2 |
Goodwill acquired during the period |  |  | 174.3 |  |  |  | 83.7 |  |  |  | — |  |  |  | 258.0 |
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) |  |  | 53.8 |  |  |  | — |  |  |  | — |  |  |  | 53.8 |
Foreign currency translation adjustments during the period |  |  | 125.5 |  |  |  | 7.2 |  |  |  | — |  |  |  | 132.7 |
Balance as of March 31, 2025 |  | $ | 12,277.0 |  |  | $ | 419.2 |  |  | $ | 18.5 |  |  | $ | 12,714.7 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at March 31, 2025 and December 31, 2024 consist of the following (in millions):
|  | March 31, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Expiration lists |  | $ | 9,001.4 |  |  | $ | 8,763.7 |
Accumulated amortization - expiration lists |  |  | (4,558.9 | ) |  |  | (4,312.7 | )
|  |  | 4,442.5 |  |  |  | 4,451.0 |
Non-compete agreements |  |  | 135.9 |  |  |  | 117.7 |
Accumulated amortization - non-compete agreements |  |  | (90.9 | ) |  |  | (85.4 | )
|  |  | 45.0 |  |  |  | 32.3 |
Trade names |  |  | 120.6 |  |  |  | 120.0 |
Accumulated amortization - trade names |  |  | (75.9 | ) |  |  | (73.2 | )
|  |  | 44.7 |  |  |  | 46.8 |
Net amortizable assets |  | $ | 4,532.2 |  |  | $ | 4,530.1 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):
2025 (remaining nine months) |  | $ | 494.3 |
2026 |  |  | 620.8 |
2027 |  |  | 581.7 |
2028 |  |  | 539.3 |
2029 |  |  | 489.5 |
Thereafter |  |  | 1,806.6 |
Total |  | $ | 4,532.2 |

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 -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -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