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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2022
Goodwill And Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at March 31, 2022 and December 31, 2021 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 4,357.2 |  |  | $ | 64.8 |  |  | $ | — |  |  | $ | 4,422.0 |
United Kingdom |  |  | 2,225.0 |  |  |  | 14.8 |  |  |  | — |  |  |  | 2,239.8 |
Canada |  |  | 593.4 |  |  |  | — |  |  |  | — |  |  |  | 593.4 |
Australia |  |  | 507.2 |  |  |  | 11.3 |  |  |  | — |  |  |  | 518.5 |
New Zealand |  |  | 223.9 |  |  |  | 10.5 |  |  |  | — |  |  |  | 234.4 |
Other foreign |  |  | 699.0 |  |  |  | — |  |  |  | 20.6 |  |  |  | 719.6 |
Total goodwill |  | $ | 8,605.7 |  |  | $ | 101.4 |  |  | $ | 20.6 |  |  | $ | 8,727.7 |
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 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three-month period ended March 31, 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 |  |  | 68.9 |  |  |  | — |  |  |  | — |  |  |  | 68.9 |
Goodwill true-ups due to appraisals and other acquisition adjustments |  |  | (18.8 | ) |  |  | — |  |  |  | — |  |  |  | (18.8 | )
Foreign currency translation adjustments during the period |  |  | 11.0 |  |  |  | 0.5 |  |  |  | (0.1 | ) |  |  | 11.4 |
Balance as of March 31, 2022 |  | $ | 8,605.7 |  |  | $ | 101.4 |  |  | $ | 20.6 |  |  | $ | 8,727.7 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at March 31, 2022 and December 31, 2021 consist of the following (in millions):
|  | March 31, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Expiration lists |  | $ | 6,749.3 |  |  | $ | 6,696.8 |
Accumulated amortization - expiration lists |  |  | (2,941.1 | ) |  |  | (2,812.2 | )
|  |  | 3,808.2 |  |  |  | 3,884.6 |
Non-compete agreements |  |  | 78.5 |  |  |  | 76.0 |
Accumulated amortization - non-compete agreements |  |  | (64.4 | ) |  |  | (62.8 | )
|  |  | 14.1 |  |  |  | 13.2 |
Trade names |  |  | 106.1 |  |  |  | 105.2 |
Accumulated amortization - trade names |  |  | (50.8 | ) |  |  | (49.0 | )
|  |  | 55.3 |  |  |  | 56.2 |
Net amortizable assets |  | $ | 3,877.6 |  |  | $ | 3,954.0 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):
2022 (remaining nine months) |  | $ | 367.2 |
2023 |  |  | 467.5 |
2024 |  |  | 431.0 |
2025 |  |  | 390.0 |
2026 |  |  | 351.2 |
Thereafter |  |  | 1,870.7 |
Total |  | $ | 3,877.6 |

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