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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2022
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 millions) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of January 1, 2021 |  | $ | 2,650.4 |  |  | $ | 1,091.1 |  |  | $ | 483.1 |  |  | $ | 171.3 |  |  | $ | 4,395.9 |
Goodwill of acquired businesses |  |  | 346.0 |  |  |  | (1.3 | ) |  |  | 5.3 |  |  |  | — |  |  |  | 350.0 |
Goodwill disposed of relating to sales of businesses |  |  | (3.1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3.1 | )
Foreign currency translation adjustments during the year |  |  | (6.1 | ) |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | (6.0 | )
Balance as of December 31, 2021 |  | $ | 2,987.2 |  |  | $ | 1,089.9 |  |  | $ | 488.4 |  |  | $ | 171.3 |  |  | $ | 4,736.8 |
Goodwill of acquired businesses |  |  | 1,366.6 |  |  |  | 516.5 |  |  |  | 111.4 |  |  |  | — |  |  |  | 1,994.5 |
Goodwill disposed of relating to sales of businesses |  |  | (38.5 | ) |  |  | — |  |  |  | (7.7 | ) |  |  | — |  |  |  | (46.2 | )
Foreign currency translation adjustments during the year |  |  | (6.3 | ) |  |  | (4.0 | ) |  |  | (0.6 | ) |  |  | — |  |  |  | (10.9 | )
Balance as of December 31, 2022 |  | $ | 4,309.0 |  |  | $ | 1,602.4 |  |  | $ | 591.5 |  |  | $ | 171.3 |  |  | $ | 6,674.2 |

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