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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at December 31, 2019 and 2018 allocated by domestic and foreign operations is as follows (in millions):
|  |  |  |  | Risk |  |  |  |  |  |  |
|  | Brokerage |  |  | Management |  |  | Corporate |  |  | Total |
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 - net |  | $ | 5,548.9 |  |  | $ | 66.6 |  |  | $ | 3.0 |  |  | $ | 5,618.5 |
At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,715.3 |  |  | $ | 29.6 |  |  | $ | — |  |  | $ | 2,744.9 |
United Kingdom |  |  | 753.7 |  |  |  | 9.2 |  |  |  | — |  |  |  | 762.9 |
Canada |  |  | 378.6 |  |  |  | — |  |  |  | — |  |  |  | 378.6 |
Australia |  |  | 406.3 |  |  |  | 0.3 |  |  |  | — |  |  |  | 406.6 |
New Zealand |  |  | 209.6 |  |  |  | 10.2 |  |  |  | — |  |  |  | 219.8 |
Other foreign |  |  | 110.1 |  |  |  | — |  |  |  | 2.7 |  |  |  | 112.8 |
Total goodwill - net |  | $ | 4,573.6 |  |  | $ | 49.3 |  |  | $ | 2.7 |  |  | $ | 4,625.6 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for 2019 and 2018 are as follows (in millions):
|  |  |  |  | Risk |  |  |  |  |  |  |
|  | Brokerage |  |  | Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2017 |  | $ | 4,119.2 |  |  | $ | 42.6 |  |  | $ | 3.0 |  |  | $ | 4,164.8 |
Goodwill acquired during the year |  |  | 574.7 |  |  |  | 9.9 |  |  |  | — |  |  |  | 584.6 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 2.2 |  |  |  | (2.3 | ) |  |  | — |  |  |  | (0.1 | )
Foreign currency translation adjustments during the year |  |  | (122.5 | ) |  |  | (0.9 | ) |  |  | (0.3 | ) |  |  | (123.7 | )
Balance as of December 31, 2018 |  |  | 4,573.6 |  |  |  | 49.3 |  |  |  | 2.7 |  |  |  | 4,625.6 |
Goodwill acquired during the year |  |  | 958.4 |  |  |  | 16.9 |  |  |  | 0.4 |  |  |  | 975.7 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 0.2 |  |  |  | (0.2 | ) |  |  | — |  |  |  | — |
Goodwill written-off related to sales of business |  |  | (7.2 | ) |  |  | — |  |  |  | — |  |  |  | (7.2 | )
Foreign currency translation adjustments during the year |  |  | 23.9 |  |  |  | 0.6 |  |  |  | (0.1 | ) |  |  | 24.4 |
Balance as of December 31, 2019 |  | $ | 5,548.9 |  |  | $ | 66.6 |  |  | $ | 3.0 |  |  | $ | 5,618.5 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets consist of the following (in millions):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Expiration lists |  | $ | 4,246.0 |  |  | $ | 3,379.4 |
Accumulated amortization - expiration lists |  |  | (2,004.3 | ) |  |  | (1,676.8 | )
|  |  | 2,241.7 |  |  |  | 1,702.6 |
Non-compete agreements |  |  | 68.4 |  |  |  | 58.0 |
Accumulated amortization - non-compete agreements |  |  | (52.5 | ) |  |  | (48.5 | )
|  |  | 15.9 |  |  |  | 9.5 |
Trade names |  |  | 91.8 |  |  |  | 86.0 |
Accumulated amortization - trade names |  |  | (30.7 | ) |  |  | (25.1 | )
|  |  | 61.1 |  |  |  | 60.9 |
Net amortizable assets |  | $ | 2,318.7 |  |  | $ | 1,773.0 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years is as follows (in millions):
2020 |  | $ | 366.5 |
2021 |  |  | 342.7 |
2022 |  |  | 316.6 |
2023 |  |  | 290.3 |
2024 |  |  | 254.0 |
Thereafter |  |  | 748.6 |
Total |  | $ | 2,318.7 |

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