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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at December 31, 2017 and 2016 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,314.2 |  |  | $ | 25.8 |  |  | $ | — |  |  | $ | 2,340.0 |
United Kingdom |  |  | 738.5 |  |  |  | 7.2 |  |  |  | — |  |  |  | 745.7 |
Canada |  |  | 375.3 |  |  |  | — |  |  |  | — |  |  |  | 375.3 |
Australia |  |  | 416.6 |  |  |  | — |  |  |  | — |  |  |  | 416.6 |
New Zealand |  |  | 209.3 |  |  |  | 9.6 |  |  |  | — |  |  |  | 218.9 |
Other foreign |  |  | 98.4 |  |  |  | — |  |  |  | 3.0 |  |  |  | 101.4 |
Total goodwill - net |  | $ | 4,152.3 |  |  | $ | 42.6 |  |  | $ | 3.0 |  |  | $ | 4,197.9 |
At December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,115.0 |  |  | $ | 23.5 |  |  | $ | — |  |  | $ | 2,138.5 |
United Kingdom |  |  | 662.2 |  |  |  | 4.3 |  |  |  | — |  |  |  | 666.5 |
Canada |  |  | 292.2 |  |  |  | — |  |  |  | — |  |  |  | 292.2 |
Australia |  |  | 382.7 |  |  |  | — |  |  |  | — |  |  |  | 382.7 |
New Zealand |  |  | 205.0 |  |  |  | 0.3 |  |  |  | — |  |  |  | 205.3 |
Other foreign |  |  | 79.8 |  |  |  | — |  |  |  | 2.8 |  |  |  | 82.6 |
Total goodwill – net |  | $ | 3,736.9 |  |  | $ | 28.1 |  |  | $ | 2.8 |  |  | $ | 3,767.8 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for 2017 and 2016 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of January 1, 2016 |  | $ | 3,635.6 |  |  | $ | 27.3 |  |  | $ | — |  |  | $ | 3,662.9 |
Goodwill acquired during the year |  |  | 222.6 |  |  |  | — |  |  |  | 2.8 |  |  |  | 225.4 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 1.8 |  |  |  | 1.6 |  |  |  | — |  |  |  | 3.4 |
Foreign currency translation adjustments during the year |  |  | (123.1 | ) |  |  | (0.8 | ) |  |  | — |  |  |  | (123.9 | )
Balance as of December 31, 2016 |  |  | 3,736.9 |  |  |  | 28.1 |  |  |  | 2.8 |  |  |  | 3,767.8 |
Goodwill acquired during the year |  |  | 290.4 |  |  |  | 14.1 |  |  |  | — |  |  |  | 304.5 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 14.7 |  |  |  | — |  |  |  | — |  |  |  | 14.7 |
Foreign currency translation adjustments during the year |  |  | 110.3 |  |  |  | 0.4 |  |  |  | 0.2 |  |  |  | 110.9 |
Balance as of December 31, 2017 |  | $ | 4,152.3 |  |  | $ | 42.6 |  |  | $ | 3.0 |  |  | $ | 4,197.9 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets consist of the following (in millions):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Expiration lists |  | $ | 3,055.9 |  |  | $ | 2,757.6 |
Accumulated amortization - expiration lists |  |  | (1,422.1 | ) |  |  | (1,143.0 | )
|  |  | 1,633.8 |  |  |  | 1,614.6 |
Non-compete agreements |  |  | 53.5 |  |  |  | 49.3 |
Accumulated amortization - non-compete agreements |  |  | (46.1 | ) |  |  | (42.1 | )
|  |  | 7.4 |  |  |  | 7.2 |
Trade names |  |  | 25.9 |  |  |  | 24.0 |
Accumulated amortization - trade names |  |  | (22.5 | ) |  |  | (18.5 | )
|  |  | 3.4 |  |  |  | 5.5 |
Net amortizable assets |  | $ | 1,644.6 |  |  | $ | 1,627.3 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years is as follows (in millions):
2018 |  | $ | 257.2 |
2019 |  |  | 243.3 |
2020 |  |  | 226.7 |
2021 |  |  | 203.4 |
2022 |  |  | 180.6 |
Total |  | $ | 1,111.2 |

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