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Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets |
6. |  | Intangible Assets
The carrying amount of goodwill at September 30, 2018 and December 31, 2017 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,626.7 |  |  | $ | 29.6 |  |  | $ | — |  |  | $ | 2,656.3 |
United Kingdom |  |  | 726.7 |  |  |  | 7.0 |  |  |  | — |  |  |  | 733.7 |
Canada |  |  | 373.2 |  |  |  | — |  |  |  | — |  |  |  | 373.2 |
Australia |  |  | 411.8 |  |  |  | — |  |  |  | — |  |  |  | 411.8 |
New Zealand |  |  | 197.4 |  |  |  | 10.1 |  |  |  | — |  |  |  | 207.5 |
Other foreign |  |  | 116.2 |  |  |  | — |  |  |  | 2.6 |  |  |  | 118.8 |
Total goodwill - net |  | $ | 4,452.0 |  |  | $ | 46.7 |  |  | $ | 2.6 |  |  | $ | 4,501.3 |
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
The changes in the carrying amount of goodwill for the nine-month period ended September 30, 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 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 |  |  | 397.4 |  |  |  | 7.3 |  |  |  | — |  |  |  | 404.7 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | 3.7 |  |  |  | (2.3 | ) |  |  | — |  |  |  | 1.4 |
Foreign currency translation adjustments during the period |  |  | (68.3 | ) |  |  | (0.9 | ) |  |  | (0.4 | ) |  |  | (69.6 | )
Balance as of September 30, 2018 |  | $ | 4,452.0 |  |  | $ | 46.7 |  |  | $ | 2.6 |  |  | $ | 4,501.3 |
Major classes of amortizable intangible assets at September 30, 2018 and December 31, 2017 consist of the following (in millions):
|  | September 30, 2018 |  |  | December 31, 2017 |
Expiration lists |  | $ | 3,342.1 |  |  | $ | 3,055.9 |
Accumulated amortization - expiration lists |  |  | (1,614.8 | ) |  |  | (1,422.1 | )
|  |  | 1,727.3 |  |  |  | 1,633.8 |
Non-compete agreements |  |  | 55.9 |  |  |  | 53.5 |
Accumulated amortization - non-compete agreements |  |  | (48.0 | ) |  |  | (46.1 | )
|  |  | 7.9 |  |  |  | 7.4 |
Trade names |  |  | 60.7 |  |  |  | 25.9 |
Accumulated amortization - trade names |  |  | (23.8 | ) |  |  | (22.5 | )
|  |  | 36.9 |  |  |  | 3.4 |
Net amortizable assets |  | $ | 1,772.1 |  |  | $ | 1,644.6 |
Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
2018 (remaining three months) |  | $ | 71.4 |
2019 |  |  | 275.4 |
2020 |  |  | 258.8 |
2021 |  |  | 235.3 |
2022 |  |  | 212.0 |
Thereafter |  |  | 719.2 |
Total |  | $ | 1,772.1 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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