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Goodwill (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill by Operating Segment | The changes in the carrying value of goodwill by reportable segment for the three months ended March 31, 2021 are as follows:
(in thousands) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of December 31, 2020 |  | $ | 2,650,470 |  |  | $ | 1,091,122 |  |  | $ | 483,057 |  |  | $ | 171,269 |  |  | $ | 4,395,918 |
Goodwill of acquired businesses |  |  | 83,301 |  |  |  | (1,337 | ) |  |  | (2,040 | ) |  |  | — |  |  |  | 79,924 |
Goodwill disposed of relating to sales of businesses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign currency translation adjustments during the year |  |  | (3,469 | ) |  |  | 669 |  |  |  | — |  |  |  | — |  |  |  | (2,800 | )
Balance as of March 31, 2021 |  | $ | 2,730,302 |  |  | $ | 1,090,454 |  |  | $ | 481,017 |  |  | $ | 171,269 |  |  | $ | 4,473,042 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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