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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at December 31, 2021 and 2020 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
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 - net |  | $ | 8,544.6 |  |  | $ | 100.9 |  |  | $ | 20.7 |  |  | $ | 8,666.2 |
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 - net |  | $ | 6,053.6 |  |  | $ | 70.5 |  |  | $ | 2.9 |  |  | $ | 6,127.0 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for 2021 and 2020 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2019 |  | $ | 5,548.9 |  |  | $ | 66.6 |  |  | $ | 3.0 |  |  | $ | 5,618.5 |
Goodwill acquired during the year |  |  | 359.6 |  |  |  | — |  |  |  | — |  |  |  | 359.6 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 29.8 |  |  |  | 1.7 |  |  |  | — |  |  |  | 31.5 |
Foreign currency translation adjustments during the year |  |  | 115.3 |  |  |  | 2.2 |  |  |  | (0.1 | ) |  |  | 117.4 |
Balance as of December 31, 2020 |  |  | 6,053.6 |  |  |  | 70.5 |  |  |  | 2.9 |  |  |  | 6,127.0 |
Goodwill acquired during the year |  |  | 2,511.8 |  |  |  | 31.6 |  |  |  | 18.1 |  |  |  | 2,561.5 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 50.8 |  |  |  | — |  |  |  | — |  |  |  | 50.8 |
Goodwill written-off related to sales of business |  |  | (1.0 | ) |  |  | — |  |  |  | — |  |  |  | (1.0 | )
Foreign currency translation adjustments during the year |  |  | (70.6 | ) |  |  | (1.2 | ) |  |  | (0.3 | ) |  |  | (72.1 | )
Balance as of December 31, 2021 |  | $ | 8,544.6 |  |  | $ | 100.9 |  |  | $ | 20.7 |  |  | $ | 8,666.2 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets consist of the following (in millions):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Expiration lists |  | $ | 6,696.8 |  |  | $ | 4,753.2 |
Accumulated amortization - expiration lists |  |  | (2,812.2 | ) |  |  | (2,436.7 | )
|  |  | 3,884.6 |  |  |  | 2,316.5 |
Non-compete agreements |  |  | 76.0 |  |  |  | 75.9 |
Accumulated amortization - non-compete agreements |  |  | (62.8 | ) |  |  | (57.8 | )
|  |  | 13.2 |  |  |  | 18.1 |
Trade names |  |  | 105.2 |  |  |  | 107.8 |
Accumulated amortization - trade names |  |  | (49.0 | ) |  |  | (42.5 | )
|  |  | 56.2 |  |  |  | 65.3 |
Net amortizable assets |  | $ | 3,954.0 |  |  | $ | 2,399.9 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years is as follows (in millions):
2022 |  | $ | 486.8 |
2023 |  |  | 461.6 |
2024 |  |  | 425.5 |
2025 |  |  | 385.6 |
2026 |  |  | 346.9 |
Thereafter |  |  | 1,847.6 |
Total |  | $ | 3,954.0 |

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