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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at September 30, 2019 and December 31, 2018 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,950.0 |  |  | $ | 33.0 |  |  | $ | — |  |  | $ | 2,983.0 |
United Kingdom |  |  | 1,138.6 |  |  |  | 12.3 |  |  |  | — |  |  |  | 1,150.9 |
Canada |  |  | 445.4 |  |  |  | — |  |  |  | — |  |  |  | 445.4 |
Australia |  |  | 404.2 |  |  |  | 10.1 |  |  |  | — |  |  |  | 414.3 |
New Zealand |  |  | 196.5 |  |  |  | 9.5 |  |  |  | — |  |  |  | 206.0 |
Other foreign |  |  | 112.1 |  |  |  | — |  |  |  | 3.1 |  |  |  | 115.2 |
Total goodwill |  | $ | 5,246.8 |  |  | $ | 64.9 |  |  | $ | 3.1 |  |  | $ | 5,314.8 |
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 |  | $ | 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 the nine-month period ended September 30, 2019 are as follows (in millions):
|  |  |  |  | Risk |  |  |  |  |  |  |
|  | Brokerage |  |  | Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2018 |  | $ | 4,573.6 |  |  | $ | 49.3 |  |  | $ | 2.7 |  |  | $ | 4,625.6 |
Goodwill acquired during the period |  |  | 738.8 |  |  |  | 16.9 |  |  |  | 0.4 |  |  |  | 756.1 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | (1.3 | ) |  |  | (0.5 | ) |  |  | — |  |  |  | (1.8 | )
Goodwill written-off related to sales of business |  |  | (7.2 | ) |  |  | — |  |  |  | — |  |  |  | (7.2 | )
Foreign currency translation adjustments during the period |  |  | (57.1 | ) |  |  | (0.8 | ) |  |  | — |  |  |  | (57.9 | )
Balance as of September 30, 2019 |  | $ | 5,246.8 |  |  | $ | 64.9 |  |  | $ | 3.1 |  |  | $ | 5,314.8 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at September 30, 2019 and December 31, 2018 consist of the following (in millions):
|  | September 30, 2019 |  |  | December 31, 2018 |
Expiration lists |  | $ | 3,880.4 |  |  | $ | 3,379.4 |
Accumulated amortization - expiration lists |  |  | (1,890.9 | ) |  |  | (1,676.8 | )
|  |  | 1,989.5 |  |  |  | 1,702.6 |
Non-compete agreements |  |  | 76.1 |  |  |  | 58.0 |
Accumulated amortization - non-compete agreements |  |  | (52.5 | ) |  |  | (48.5 | )
|  |  | 23.6 |  |  |  | 9.5 |
Trade names |  |  | 89.4 |  |  |  | 86.0 |
Accumulated amortization - trade names |  |  | (29.0 | ) |  |  | (25.1 | )
|  |  | 60.4 |  |  |  | 60.9 |
Net amortizable assets |  | $ | 2,073.5 |  |  | $ | 1,773.0 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
2019 (remaining three months) |  | $ | 85.3 |
2020 |  |  | 328.9 |
2021 |  |  | 304.7 |
2022 |  |  | 275.6 |
2023 |  |  | 249.2 |
Thereafter |  |  | 829.8 |
Total |  | $ | 2,073.5 |

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