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Goodwill (Tables) | 3 Months Ended
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Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill by Reportable Segment | The changes in the carrying value of goodwill by reportable segment for the three months ended March 31, 2023 are as follows:
(in millions) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of December 31, 2022 |  | $ | 4,309.0 |  |  | $ | 1,602.4 |  |  | $ | 591.5 |  |  | $ | 171.3 |  |  | $ | 6,674.2 |
Goodwill of acquired businesses |  |  | 44.6 |  |  |  | (21.6 | ) |  |  | — |  |  |  | — |  |  |  | 23.0 |
Goodwill disposed of relating to sales of businesses |  |  | — |  |  |  | (2.7 | ) |  |  | — |  |  |  | — |  |  |  | (2.7 | )
Foreign currency translation and other adjustments during the year |  |  | 34.3 |  |  |  | (1.1 | ) |  |  | 2.5 |  |  |  | — |  |  |  | 35.7 |
Balance as of March 31, 2023 |  | $ | 4,387.9 |  |  | $ | 1,577.0 |  |  | $ | 594.0 |  |  | $ | 171.3 |  |  | $ | 6,730.2 |

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