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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at September 30, 2020 and December 31, 2019 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,267.0 |  |  | $ | 33.2 |  |  | $ | — |  |  | $ | 3,300.2 |
United Kingdom |  |  | 1,260.4 |  |  |  | 13.9 |  |  |  | — |  |  |  | 1,274.3 |
Canada |  |  | 450.3 |  |  |  | — |  |  |  | — |  |  |  | 450.3 |
Australia |  |  | 433.8 |  |  |  | 10.8 |  |  |  | — |  |  |  | 444.6 |
New Zealand |  |  | 206.7 |  |  |  | 10.0 |  |  |  | — |  |  |  | 216.7 |
Other foreign |  |  | 143.2 |  |  |  | — |  |  |  | 2.9 |  |  |  | 146.1 |
Total goodwill |  | $ | 5,761.4 |  |  | $ | 67.9 |  |  | $ | 2.9 |  |  | $ | 5,832.2 |
At December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,163.8 |  |  | $ | 33.1 |  |  | $ | — |  |  | $ | 3,196.9 |
United Kingdom |  |  | 1,177.8 |  |  |  | 12.9 |  |  |  | — |  |  |  | 1,190.7 |
Canada |  |  | 454.4 |  |  |  | — |  |  |  | — |  |  |  | 454.4 |
Australia |  |  | 416.5 |  |  |  | 10.5 |  |  |  | — |  |  |  | 427.0 |
New Zealand |  |  | 208.0 |  |  |  | 10.1 |  |  |  | — |  |  |  | 218.1 |
Other foreign |  |  | 128.4 |  |  |  | — |  |  |  | 3.0 |  |  |  | 131.4 |
Total goodwill |  | $ | 5,548.9 |  |  | $ | 66.6 |  |  | $ | 3.0 |  |  | $ | 5,618.5 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the nine-month period ended September 30, 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 period |  |  | 200.7 |  |  |  | — |  |  |  | — |  |  |  | 200.7 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | 29.2 |  |  |  | 1.3 |  |  |  | — |  |  |  | 30.5 |
Foreign currency translation adjustments during the period |  |  | (17.4 | ) |  |  | — |  |  |  | (0.1 | ) |  |  | (17.5 | )
Balance as of September 30, 2020 |  | $ | 5,761.4 |  |  | $ | 67.9 |  |  | $ | 2.9 |  |  | $ | 5,832.2 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at September 30, 2020 and December 31, 2019 consist of the following (in millions):
|  | September 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Expiration lists |  | $ | 4,434.7 |  |  | $ | 4,246.0 |
Accumulated amortization - expiration lists |  |  | (2,310.2 | ) |  |  | (2,004.3 | )
|  |  | 2,124.5 |  |  |  | 2,241.7 |
Non-compete agreements |  |  | 66.6 |  |  |  | 68.4 |
Accumulated amortization - non-compete agreements |  |  | (55.5 | ) |  |  | (52.5 | )
|  |  | 11.1 |  |  |  | 15.9 |
Trade names |  |  | 98.9 |  |  |  | 91.8 |
Accumulated amortization - trade names |  |  | (39.5 | ) |  |  | (30.7 | )
|  |  | 59.4 |  |  |  | 61.1 |
Net amortizable assets |  | $ | 2,195.0 |  |  | $ | 2,318.7 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
2020 (remaining three months) |  | $ | 90.9 |
2021 |  |  | 346.3 |
2022 |  |  | 320.6 |
2023 |  |  | 295.7 |
2024 |  |  | 260.6 |
Thereafter |  |  | 880.9 |
Total |  | $ | 2,195.0 |

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