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Intangible Assets | 9 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 6. Intangible Assets The carrying amount of goodwill at September 30, 2022 and December 31, 2021 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 4,638.0 |  |  | $ | 74.8 |  |  | $ | — |  |  | $ | 4,712.8 |
United Kingdom |  |  | 2,040.1 |  |  |  | 16.5 |  |  |  | — |  |  |  | 2,056.6 |
Canada |  |  | 581.0 |  |  |  | — |  |  |  | — |  |  |  | 581.0 |
Australia |  |  | 449.4 |  |  |  | 10.1 |  |  |  | — |  |  |  | 459.5 |
New Zealand |  |  | 189.6 |  |  |  | 8.9 |  |  |  | — |  |  |  | 198.5 |
Other foreign |  |  | 809.0 |  |  |  | — |  |  |  | 19.8 |  |  |  | 828.8 |
Total goodwill |  | $ | 8,707.1 |  |  | $ | 110.3 |  |  | $ | 19.8 |  |  | $ | 8,837.2 |
At December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 4,409.1 |  |  | $ | 64.8 |  |  | $ | — |  |  | $ | 4,473.9 |
United Kingdom |  |  | 2,198.7 |  |  |  | 15.0 |  |  |  | — |  |  |  | 2,213.7 |
Canada |  |  | 572.9 |  |  |  | — |  |  |  | — |  |  |  | 572.9 |
Australia |  |  | 487.2 |  |  |  | 10.9 |  |  |  | — |  |  |  | 498.1 |
New Zealand |  |  | 217.6 |  |  |  | 10.2 |  |  |  | — |  |  |  | 227.8 |
Other foreign |  |  | 659.1 |  |  |  | — |  |  |  | 20.7 |  |  |  | 679.8 |
Total goodwill |  | $ | 8,544.6 |  |  | $ | 100.9 |  |  | $ | 20.7 |  |  | $ | 8,666.2 |
The changes in the carrying amount of goodwill for the nine-month period ended September 30, 2022 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2021 |  | $ | 8,544.6 |  |  | $ | 100.9 |  |  | $ | 20.7 |  |  | $ | 8,666.2 |
Goodwill acquired during the period |  |  | 267.1 |  |  |  | 16.0 |  |  |  | — |  |  |  | 283.1 |
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) |  |  | 395.8 |  |  |  | (1.6 | ) |  |  | 0.2 |  |  |  | 394.4 |
Foreign currency translation adjustments during the period |  |  | (500.4 | ) |  |  | (5.0 | ) |  |  | (1.1 | ) |  |  | (506.5 | )
Balance as of September 30, 2022 |  | $ | 8,707.1 |  |  | $ | 110.3 |  |  | $ | 19.8 |  |  | $ | 8,837.2 |
Major classes of amortizable intangible assets at September 30, 2022 and December 31, 2021 consist of the following (in millions):
|  | September 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Expiration lists |  | $ | 6,008.7 |  |  | $ | 6,696.8 |
Accumulated amortization - expiration lists |  |  | (3,022.7 | ) |  |  | (2,812.2 | )
|  |  | 2,986.0 |  |  |  | 3,884.6 |
Non-compete agreements |  |  | 78.3 |  |  |  | 76.0 |
Accumulated amortization - non-compete agreements |  |  | (64.4 | ) |  |  | (62.8 | )
|  |  | 13.9 |  |  |  | 13.2 |
Trade names |  |  | 103.3 |  |  |  | 105.2 |
Accumulated amortization - trade names |  |  | (50.8 | ) |  |  | (49.0 | )
|  |  | 52.5 |  |  |  | 56.2 |
Net amortizable assets |  | $ | 3,052.4 |  |  | $ | 3,954.0 |
Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):
2022 (remaining three months) |  | $ | 109.4 |
2023 |  |  | 421.5 |
2024 |  |  | 385.6 |
2025 |  |  | 345.4 |
2026 |  |  | 307.7 |
Thereafter |  |  | 1,482.8 |
Total |  | $ | 3,052.4 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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