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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at March 31, 2018 and December 31, 2017 allocated by domestic and foreign operations is as follows (in millions):
At March 31, 2018 |  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
United States |  | $ | 2,315.9 |  |  | $ | 25.1 |  |  | $ | — |  |  | $ | 2,341.0 |
United Kingdom |  |  | 776.0 |  |  |  | 7.6 |  |  |  | — |  |  |  | 783.6 |
Canada |  |  | 367.8 |  |  |  | — |  |  |  | — |  |  |  | 367.8 |
Australia |  |  | 414.1 |  |  |  | — |  |  |  | — |  |  |  | 414.1 |
New Zealand |  |  | 214.0 |  |  |  | 10.9 |  |  |  | — |  |  |  | 224.9 |
Other foreign |  |  | 102.0 |  |  |  | — |  |  |  | 2.9 |  |  |  | 104.9 |
Total goodwill - net |  | $ | 4,189.8 |  |  | $ | 43.6 |  |  | $ | 2.9 |  |  | $ | 4,236.3 |
At December 31, 2017 |  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
United States |  | $ | 2,280.9 |  |  | $ | 25.8 |  |  | $ | — |  |  | $ | 2,306.7 |
United Kingdom |  |  | 738.5 |  |  |  | 7.2 |  |  |  | — |  |  |  | 745.7 |
Canada |  |  | 374.0 |  |  |  | — |  |  |  | — |  |  |  | 374.0 |
Australia |  |  | 416.6 |  |  |  | — |  |  |  | — |  |  |  | 416.6 |
New Zealand |  |  | 209.3 |  |  |  | 9.6 |  |  |  | — |  |  |  | 218.9 |
Other foreign |  |  | 99.9 |  |  |  | — |  |  |  | 3.0 |  |  |  | 102.9 |
Total goodwill - net |  | $ | 4,119.2 |  |  | $ | 42.6 |  |  | $ | 3.0 |  |  | $ | 4,164.8 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three-month period ended March 31, 2018 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2017, as previously reported |  | $ | 4,152.3 |  |  | $ | 42.6 |  |  | $ | 3.0 |  |  | $ | 4,197.9 |
Adoption of ASC Topic 606 |  |  | (33.1 | ) |  |  | — |  |  |  | — |  |  |  | (33.1 | )
Balance at December 31, 2017, as restated |  |  | 4,119.2 |  |  |  | 42.6 |  |  |  | 3.0 |  |  | $ | 4,164.8 |
Goodwill acquired during the period |  |  | 38.3 |  |  |  | 2.7 |  |  |  | — |  |  |  | 41.0 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | 1.9 |  |  |  | (2.3 | ) |  |  | — |  |  |  | (0.4 | )
Foreign currency translation adjustments during the period |  |  | 30.4 |  |  |  | 0.6 |  |  |  | (0.1 | ) |  |  | 30.9 |
Balance as of March 31, 2018 |  | $ | 4,189.8 |  |  | $ | 43.6 |  |  | $ | 2.9 |  |  | $ | 4,236.3 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at March 31, 2018 and December 31, 2017 consist of the following (in millions):
|  | March 31, 2018 |  |  | December 31, 2017 |
Expiration lists |  | $ | 3,128.1 |  |  | $ | 3,055.9 |
Accumulated amortization - expiration lists |  |  | (1,498.4 | ) |  |  | (1,422.1 | )
|  |  | 1,629.7 |  |  |  | 1,633.8 |
Non-compete agreements |  |  | 54.3 |  |  |  | 53.5 |
Accumulated amortization - non-compete agreements |  |  | (47.3 | ) |  |  | (46.1 | )
|  |  | 7.0 |  |  |  | 7.4 |
Trade names |  |  | 26.3 |  |  |  | 25.9 |
Accumulated amortization - trade names |  |  | (23.4 | ) |  |  | (22.5 | )
|  |  | 2.9 |  |  |  | 3.4 |
Net amortizable assets |  | $ | 1,639.6 |  |  | $ | 1,644.6 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
2018 (remaining nine months) |  | $ | 198.2 |
2019 |  |  | 251.4 |
2020 |  |  | 234.6 |
2021 |  |  | 211.0 |
2022 |  |  | 187.4 |
Thereafter |  |  | 557.0 |
Total |  | $ | 1,639.6 |

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