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Intangible Assets | 6 Months Ended
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Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 6. Intangible Assets The carrying amount of goodwill at June 30, 2020 and December 31, 2019 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,250.9 |  |  | $ | 33.1 |  |  | $ | — |  |  | $ | 3,284.0 |
United Kingdom |  |  | 1,237.1 |  |  |  | 13.5 |  |  |  | — |  |  |  | 1,250.6 |
Canada |  |  | 439.2 |  |  |  | — |  |  |  | — |  |  |  | 439.2 |
Australia |  |  | 417.1 |  |  |  | 10.5 |  |  |  | — |  |  |  | 427.6 |
New Zealand |  |  | 201.8 |  |  |  | 9.8 |  |  |  | — |  |  |  | 211.6 |
Other foreign |  |  | 140.6 |  |  |  | — |  |  |  | 2.8 |  |  |  | 143.4 |
Total goodwill |  | $ | 5,686.7 |  |  | $ | 66.9 |  |  | $ | 2.8 |  |  | $ | 5,756.4 |
At December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,163.8 |  |  | $ | 33.1 |  |  | $ | — |  |  | $ | 3,196.9 |
United Kingdom |  |  | 1,177.8 |  |  |  | 12.9 |  |  |  | — |  |  |  | 1,190.7 |
Canada |  |  | 454.4 |  |  |  | — |  |  |  | — |  |  |  | 454.4 |
Australia |  |  | 416.5 |  |  |  | 10.5 |  |  |  | — |  |  |  | 427.0 |
New Zealand |  |  | 208.0 |  |  |  | 10.1 |  |  |  | — |  |  |  | 218.1 |
Other foreign |  |  | 128.4 |  |  |  | — |  |  |  | 3.0 |  |  |  | 131.4 |
Total goodwill |  | $ | 5,548.9 |  |  | $ | 66.6 |  |  | $ | 3.0 |  |  | $ | 5,618.5 |
The changes in the carrying amount of goodwill for the six-month period ended June 30, 2020 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2019 |  | $ | 5,548.9 |  |  | $ | 66.6 |  |  | $ | 3.0 |  |  | $ | 5,618.5 |
Goodwill acquired during the period |  |  | 190.5 |  |  |  | — |  |  |  | — |  |  |  | 190.5 |
Goodwill adjustments due to appraisals and other acquisition adjustments |  |  | 27.9 |  |  |  | 1.3 |  |  |  | — |  |  |  | 29.2 |
Foreign currency translation adjustments during the period |  |  | (80.6 | ) |  |  | (1.0 | ) |  |  | (0.2 | ) |  |  | (81.8 | )
Balance as of June 30, 2020 |  | $ | 5,686.7 |  |  | $ | 66.9 |  |  | $ | 2.8 |  |  | $ | 5,756.4 |
Major classes of amortizable intangible assets at June 30, 2020 and December 31, 2019 consist of the following (in millions):
|  | June 30, |  |  | December 31, |
|  | 2020 |  |  | 2019 |
Expiration lists |  | $ | 4,342.8 |  |  | $ | 4,246.0 |
Accumulated amortization - expiration lists |  |  | (2,203.2 | ) |  |  | (2,004.3 | )
|  |  | 2,139.6 |  |  |  | 2,241.7 |
Non-compete agreements |  |  | 67.0 |  |  |  | 68.4 |
Accumulated amortization - non-compete agreements |  |  | (54.0 | ) |  |  | (52.5 | )
|  |  | 13.0 |  |  |  | 15.9 |
Trade names |  |  | 107.2 |  |  |  | 91.8 |
Accumulated amortization - trade names |  |  | (33.8 | ) |  |  | (30.7 | )
|  |  | 73.4 |  |  |  | 61.1 |
Net amortizable assets |  | $ | 2,226.0 |  |  | $ | 2,318.7 |
Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
2020 (remaining six months) |  | $ | 178.7 |
2021 |  |  | 337.8 |
2022 |  |  | 312.3 |
2023 |  |  | 287.6 |
2024 |  |  | 252.9 |
Thereafter |  |  | 856.7 |
Total |  | $ | 2,226.0 |

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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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