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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($)
Goodwill [Line Items] |
Beginning balance | $ 6,674.2
Goodwill adjustment during measurement period | (9.7)
Goodwill of acquired businesses | 163.9
Goodwill disposed of relating to sales of businesses | (2.7)
Foreign currency translation adjustments during the year | 19.9
Ending balance | 6,845.6
Retail |
Goodwill [Line Items] |
Beginning balance | 4,309.0
Goodwill adjustment during measurement period | 15.5
Goodwill of acquired businesses | 138.6
Goodwill disposed of relating to sales of businesses | 0.0
Foreign currency translation adjustments during the year | 18.5
Ending balance | 4,481.6
National Programs |
Goodwill [Line Items] |
Beginning balance | 1,602.4
Goodwill adjustment during measurement period | (23.5)
Goodwill of acquired businesses | 2.4
Goodwill disposed of relating to sales of businesses | (2.7)
Foreign currency translation adjustments during the year | (0.1)
Ending balance | 1,578.5
Wholesale Brokerage |
Goodwill [Line Items] |
Beginning balance | 591.5
Goodwill adjustment during measurement period | (1.7)
Goodwill of acquired businesses | 22.9
Goodwill disposed of relating to sales of businesses | 0.0
Foreign currency translation adjustments during the year | 1.5
Ending balance | 614.2
Services |
Goodwill [Line Items] |
Beginning balance | 171.3
Goodwill adjustment during measurement period | 0.0
Goodwill of acquired businesses | 0.0
Goodwill disposed of relating to sales of businesses | 0.0
Foreign currency translation adjustments during the year | 0.0
Ending balance | $ 171.3

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