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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 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 |  |  | 18.9 |  |  |  | 402.3 |  |  |  | 0.2 |  |  |  | — |  |  |  | 421.4 |
Goodwill disposed of relating to sales of businesses |  |  | (2.0 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2.0 | )
Foreign currency translation adjustments during the year |  |  | (6.2 | ) |  |  | (1.0 | ) |  |  | — |  |  |  | — |  |  |  | (7.2 | )
Balance as of June 30, 2022 |  | $ | 2,997.9 |  |  | $ | 1,491.2 |  |  | $ | 488.6 |  |  | $ | 171.3 |  |  | $ | 5,149.0 |

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