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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2022
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 nine months ended September 30, 2022 are as follows:
(in millions) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of December 31, 2021 |  | $ | 2,987.2 |  |  | $ | 1,089.9 |  |  | $ | 488.4 |  |  | $ | 171.3 |  |  | $ | 4,736.8 |
Goodwill of acquired businesses |  |  | 1,389.0 |  |  |  | 427.8 |  |  |  | 105.4 |  |  |  | — |  |  |  | 1,922.2 |
Goodwill disposed of relating to sales of businesses |  |  | (2.6 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2.6 | )
Foreign currency translation adjustments during the year |  |  | (118.1 | ) |  |  | (6.9 | ) |  |  | (9.1 | ) |  |  | — |  |  |  | (134.1 | )
Balance as of September 30, 2022 |  | $ | 4,255.5 |  |  | $ | 1,510.8 |  |  | $ | 584.7 |  |  | $ | 171.3 |  |  | $ | 6,522.3 |

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