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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations | The carrying amount of goodwill at March 31, 2017 and December 31, 2016 allocated by domestic and foreign operations is as follows (in millions):
At March 31, 2017 |  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
United States |  | $ | 2,201.6 |  |  | $ | 23.5 |  |  | $ | — |  |  | $ | 2,225.1 |
United Kingdom |  |  | 667.8 |  |  |  | 4.3 |  |  |  | — |  |  |  | 672.1 |
Canada |  |  | 293.8 |  |  |  | — |  |  |  | — |  |  |  | 293.8 |
Australia |  |  | 410.9 |  |  |  | — |  |  |  | — |  |  |  | 410.9 |
New Zealand |  |  | 208.5 |  |  |  | 0.3 |  |  |  | — |  |  |  | 208.8 |
Other foreign |  |  | 83.3 |  |  |  | — |  |  |  | 2.9 |  |  |  | 86.2 |
Total goodwill - net |  | $ | 3,865.9 |  |  | $ | 28.1 |  |  | $ | 2.9 |  |  | $ | 3,896.9 |
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 the three-month period ended March 31, 2017 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2016 |  | $ | 3,736.9 |  |  | $ | 28.1 |  |  | $ | 2.8 |  |  | $ | 3,767.8 |
Goodwill acquired during the period |  |  | 91.9 |  |  |  | — |  |  |  | — |  |  |  | 91.9 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | 1.6 |  |  |  | — |  |  |  | — |  |  |  | 1.6 |
Foreign currency translation adjustments during the period |  |  | 35.5 |  |  |  | — |  |  |  | 0.1 |  |  |  | 35.6 |
Balance as of March 31, 2017 |  | $ | 3,865.9 |  |  | $ | 28.1 |  |  | $ | 2.9 |  |  | $ | 3,896.9 |
Major Classes of Amortizable Intangible Assets | Major classes of amortizable intangible assets at March 31, 2017 and December 31, 2016 consist of the following (in millions):
|  | March 31, 2017 |  |  | December 31, 2016 |
Expiration lists |  | $ | 2,880.5 |  |  | $ | 2,757.6 |
Accumulated amortization - expiration lists |  |  | (1,210.1 | ) |  |  | (1,143.0 | )
|  |  | 1,670.4 |  |  |  | 1,614.6 |
Non-compete agreements |  |  | 50.5 |  |  |  | 49.3 |
Accumulated amortization - non-compete agreements |  |  | (43.3 | ) |  |  | (42.1 | )
|  |  | 7.2 |  |  |  | 7.2 |
Trade names |  |  | 24.4 |  |  |  | 24.0 |
Accumulated amortization - trade names |  |  | (19.9 | ) |  |  | (18.5 | )
|  |  | 4.5 |  |  |  | 5.5 |
Net amortizable assets |  | $ | 1,682.1 |  |  | $ | 1,627.3 |
Estimated Aggregate Amortization Expense | Estimated aggregate amortization expense for each of the next five years is as follows:
2017 (remaining nine months) |  | $ | 190.8 |
2018 |  |  | 239.9 |
2019 |  |  | 225.8 |
2020 |  |  | 209.6 |
2021 |  |  | 187.2 |
Total |  | $ | 1,053.3 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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