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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 7. Intangible Assets The carrying amount of goodwill at December 31, 2020 and 2019 allocated by domestic and foreign operations is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
At December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 3,399.8 |  |  | $ | 33.2 |  |  | $ | - |  |  | $ | 3,433.0 |
United Kingdom |  |  | 1,328.3 |  |  |  | 15.1 |  |  |  | - |  |  |  | 1,343.4 |
Canada |  |  | 492.9 |  |  |  | - |  |  |  | - |  |  |  | 492.9 |
Australia |  |  | 462.1 |  |  |  | 11.5 |  |  |  | - |  |  |  | 473.6 |
New Zealand |  |  | 221.9 |  |  |  | 10.7 |  |  |  | - |  |  |  | 232.6 |
Other foreign |  |  | 148.6 |  |  |  | - |  |  |  | 2.9 |  |  |  | 151.5 |
Total goodwill - net |  | $ | 6,053.6 |  |  | $ | 70.5 |  |  | $ | 2.9 |  |  | $ | 6,127.0 |
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 - net |  | $ | 5,548.9 |  |  | $ | 66.6 |  |  | $ | 3.0 |  |  | $ | 5,618.5 |
The changes in the carrying amount of goodwill for 2020 and 2019 are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Corporate |  |  | Total |
Balance as of December 31, 2018 |  | $ | 4,573.6 |  |  | $ | 49.3 |  |  | $ | 2.7 |  |  | $ | 4,625.6 |
Goodwill acquired during the year |  |  | 958.4 |  |  |  | 16.9 |  |  |  | 0.4 |  |  |  | 975.7 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 0.2 |  |  |  | (0.2 | ) |  |  | - |  |  |  | - |
Goodwill written-off related to sales of business |  |  | (7.2 | ) |  |  | - |  |  |  | - |  |  |  | (7.2 | )
Foreign currency translation adjustments during the year |  |  | 23.9 |  |  |  | 0.6 |  |  |  | (0.1 | ) |  |  | 24.4 |
Balance as of December 31, 2019 |  |  | 5,548.9 |  |  |  | 66.6 |  |  |  | 3.0 |  |  |  | 5,618.5 |
Goodwill acquired during the year |  |  | 359.6 |  |  |  | - |  |  |  | - |  |  |  | 359.6 |
Goodwill adjustments related to appraisals and other acquisition adjustments |  |  | 29.8 |  |  |  | 1.7 |  |  |  | - |  |  |  | 31.5 |
Foreign currency translation adjustments during the year |  |  | 115.3 |  |  |  | 2.2 |  |  |  | (0.1 | ) |  |  | 117.4 |
Balance as of December 31, 2020 |  | $ | 6,053.6 |  |  | $ | 70.5 |  |  | $ | 2.9 |  |  | $ | 6,127.0 |
Major classes of amortizable intangible assets consist of the following (in millions):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Expiration lists |  | $ | 4,753.2 |  |  | $ | 4,246.0 |
Accumulated amortization - expiration lists |  |  | (2,436.7 | ) |  |  | (2,004.3 | )
|  |  | 2,316.5 |  |  |  | 2,241.7 |
Non-compete agreements |  |  | 75.9 |  |  |  | 68.4 |
Accumulated amortization - non-compete agreements |  |  | (57.8 | ) |  |  | (52.5 | )
|  |  | 18.1 |  |  |  | 15.9 |
Trade names |  |  | 107.8 |  |  |  | 91.8 |
Accumulated amortization - trade names |  |  | (42.5 | ) |  |  | (30.7 | )
|  |  | 65.3 |  |  |  | 61.1 |
Net amortizable assets |  | $ | 2,399.9 |  |  | $ | 2,318.7 |
Estimated aggregate amortization expense for each of the next five years is as follows (in millions):
2021 |  | $ | 378.4 |
2022 |  |  | 352.3 |
2023 |  |  | 327.1 |
2024 |  |  | 291.3 |
2025 |  |  | 251.3 |
Thereafter |  |  | 799.5 |
Total |  | $ | 2,399.9 |

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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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