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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
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 years ended December 31, are as follows:
(in thousands) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of January 1, 2019 |  | $ | 2,063,150 |  |  | $ | 926,206 |  |  | $ | 291,622 |  |  | $ | 151,808 |  |  | $ | 3,432,786 |
Goodwill of acquired businesses |  |  | 302,640 |  |  |  | 74 |  |  |  | 6,479 |  |  |  | 19,353 |  |  |  | 328,546 |
Goodwill disposed of relating to sales of businesses |  |  | (14,499 | ) |  |  | (739 | ) |  |  | — |  |  |  | — |  |  |  | (15,238 | )
Balance as of December 31, 2019 |  | $ | 2,351,291 |  |  | $ | 925,541 |  |  | $ | 298,101 |  |  | $ | 171,161 |  |  | $ | 3,746,094 |
Goodwill of acquired businesses |  |  | 299,961 |  |  |  | 163,070 |  |  |  | 184,956 |  |  |  | 108 |  |  |  | 648,095 |
Goodwill disposed of relating to sales of businesses |  |  | (782 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (782 | )
Foreign currency translation adjustments during the year |  |  | — |  |  |  | 2,511 |  |  |  | — |  |  |  | — |  |  |  | 2,511 |
Balance as of December 31, 2020 |  | $ | 2,650,470 |  |  | $ | 1,091,122 |  |  | $ | 483,057 |  |  | $ | 171,269 |  |  | $ | 4,395,918 |

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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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