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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at June 30, 2022 and December 31, 2021 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At June 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 4,917.6 |  |  | $ | 64.8 |  |  | $ | — |  |  | $ | 4,982.4 |
United Kingdom |  |  | 1,978.1 |  |  |  | 19.5 |  |  |  | — |  |  |  | 1,997.6 |
Canada |  |  | 592.2 |  |  |  | — |  |  |  | — |  |  |  | 592.2 |
Australia |  |  | 456.6 |  |  |  | 10.5 |  |  |  | — |  |  |  | 467.1 |
New Zealand |  |  | 203.5 |  |  |  | 9.5 |  |  |  | — |  |  |  | 213.0 |
Other foreign |  |  | 763.8 |  |  |  | — |  |  |  | 20.3 |  |  |  | 784.1 |
Total goodwill |  | $ | 8,911.8 |  |  | $ | 104.3 |  |  | $ | 20.3 |  |  | $ | 9,036.4 |
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 six-month period ended June 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 |  |  | 207.6 |  |  |  | 6.0 |  |  |  | — |  |  |  | 213.6 |
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) |  |  | 407.8 |  |  |  | — |  |  |  | 0.2 |  |  |  | 408.0 |
Foreign currency translation adjustments during the period |  |  | (248.2 | ) |  |  | (2.6 | ) |  |  | (0.6 | ) |  |  | (251.4 | )
Balance as of June 30, 2022 |  | $ | 8,911.8 |  |  | $ | 104.3 |  |  | $ | 20.3 |  |  | $ | 9,036.4 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at June 30, 2022 and December 31, 2021 consist of the following (in millions):
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Expiration lists |  | $ | 6,091.6 |  |  | $ | 6,696.8 |
Accumulated amortization - expiration lists |  |  | (2,973.4 | ) |  |  | (2,812.2 | )
|  |  | 3,118.2 |  |  |  | 3,884.6 |
Non-compete agreements |  |  | 83.0 |  |  |  | 76.0 |
Accumulated amortization - non-compete agreements |  |  | (64.4 | ) |  |  | (62.8 | )
|  |  | 18.6 |  |  |  | 13.2 |
Trade names |  |  | 104.9 |  |  |  | 105.2 |
Accumulated amortization - trade names |  |  | (50.8 | ) |  |  | (49.0 | )
|  |  | 54.1 |  |  |  | 56.2 |
Net amortizable assets |  | $ | 3,190.9 |  |  | $ | 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 six months) |  | $ | 223.9 |
2023 |  |  | 429.3 |
2024 |  |  | 392.4 |
2025 |  |  | 350.5 |
2026 |  |  | 312.1 |
Thereafter |  |  | 1,482.7 |
Total |  | $ | 3,190.9 |

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