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Intangible Assets | 9 Months Ended
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Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 6. Intangible Assets The carrying amount of goodwill at September 30, 2021 and December 31, 2020 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,568.9 |  |  | $ | 64.8 |  |  | $ | — |  |  | $ | 3,633.7 |
United Kingdom |  |  | 1,606.4 |  |  |  | 15.4 |  |  |  | — |  |  |  | 1,621.8 |
Canada |  |  | 523.0 |  |  |  | — |  |  |  | — |  |  |  | 523.0 |
Australia |  |  | 450.0 |  |  |  | 11.0 |  |  |  | — |  |  |  | 461.0 |
New Zealand |  |  | 220.5 |  |  |  | 10.6 |  |  |  | — |  |  |  | 231.1 |
Other foreign |  |  | 154.0 |  |  |  | — |  |  |  | 2.9 |  |  |  | 156.9 |
Total goodwill |  | $ | 6,522.8 |  |  | $ | 101.8 |  |  | $ | 2.9 |  |  | $ | 6,627.5 |
At December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,399.8 |  |  | $ | 33.2 |  |  | $ | — |  |  | $ | 3,433.0 |
United Kingdom |  |  | 1,328.3 |  |  |  | 15.1 |  |  |  | — |  |  |  | 1,343.4 |
Canada |  |  | 492.9 |  |  |  | — |  |  |  | — |  |  |  | 492.9 |
Australia |  |  | 462.1 |  |  |  | 11.5 |  |  |  | — |  |  |  | 473.6 |
New Zealand |  |  | 221.9 |  |  |  | 10.7 |  |  |  | — |  |  |  | 232.6 |
Other foreign |  |  | 148.6 |  |  |  | — |  |  |  | 2.9 |  |  |  | 151.5 |
Total goodwill |  | $ | 6,053.6 |  |  | $ | 70.5 |  |  | $ | 2.9 |  |  | $ | 6,127.0 |
The changes in the carrying amount of goodwill for the nine-month period ended September 30, 2021 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2020 |  | $ | 6,053.6 |  |  | $ | 70.5 |  |  | $ | 2.9 |  |  | $ | 6,127.0 |
Goodwill acquired during the period |  |  | 421.9 |  |  |  | 31.6 |  |  |  | — |  |  |  | 453.5 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | 50.5 |  |  |  | — |  |  |  | — |  |  |  | 50.5 |
Goodwill written-off related to sales of business and impairment |  |  | (1.0 | ) |  |  | — |  |  |  | — |  |  |  | (1.0 | )
Foreign currency translation adjustments during the period |  |  | (2.2 | ) |  |  | (0.3 | ) |  |  | — |  |  |  | (2.5 | )
Balance as of September 30, 2021 |  | $ | 6,522.8 |  |  | $ | 101.8 |  |  | $ | 2.9 |  |  | $ | 6,627.5 |
Major classes of amortizable intangible assets at September 30, 2021 and December 31, 2020 consist of the following (in millions):
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Expiration lists |  | $ | 4,997.2 |  |  | $ | 4,753.2 |
Accumulated amortization - expiration lists |  |  | (2,727.5 | ) |  |  | (2,436.7 | )
|  |  | 2,269.7 |  |  |  | 2,316.5 |
Non-compete agreements |  |  | 73.5 |  |  |  | 75.9 |
Accumulated amortization - non-compete agreements |  |  | (61.9 | ) |  |  | (57.8 | )
|  |  | 11.6 |  |  |  | 18.1 |
Trade names |  |  | 105.5 |  |  |  | 107.8 |
Accumulated amortization - trade names |  |  | (47.8 | ) |  |  | (42.5 | )
|  |  | 57.7 |  |  |  | 65.3 |
Net amortizable assets |  | $ | 2,339.0 |  |  | $ | 2,399.9 |
Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):
2021 (remaining three months) |  | $ | 96.0 |
2022 |  |  | 367.7 |
2023 |  |  | 342.4 |
2024 |  |  | 306.1 |
2025 |  |  | 266.2 |
Thereafter |  |  | 960.6 |
Total |  | $ | 2,339.0 |

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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 http://asc.fasb.org/topic&trid=2144416 + Details
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