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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Line Items] |  |
Beginning balance | $ 6,674.2 | $ 4,736.8
Goodwill adjustment during measurement period | (12.0) |
Goodwill of acquired businesses | 620.7 | 1,994.5
Goodwill disposed of relating to sales of businesses | (46.9) | (46.2)
Foreign currency translation adjustments during the year | 104.8 | (10.9)
Ending balance | 7,340.8 | 6,674.2
Retail |  |
Goodwill [Line Items] |  |
Beginning balance | 4,309.0 | 2,987.2
Goodwill adjustment during measurement period | 13.1 |
Goodwill of acquired businesses | 335.4 | 1,366.6
Goodwill disposed of relating to sales of businesses | (0.2) | (38.5)
Foreign currency translation adjustments during the year | 84.8 | (6.3)
Ending balance | 4,742.1 | 4,309.0
National Programs |  |
Goodwill [Line Items] |  |
Beginning balance | 1,602.4 | 1,089.9
Goodwill adjustment during measurement period | (23.5) |
Goodwill of acquired businesses | 262.5 | 516.5
Goodwill disposed of relating to sales of businesses | (2.7) | 0.0
Foreign currency translation adjustments during the year | 14.3 | (4.0)
Ending balance | 1,853.0 | 1,602.4
Wholesale Brokerage |  |
Goodwill [Line Items] |  |
Beginning balance | 591.5 | 488.4
Goodwill adjustment during measurement period | (1.6) |
Goodwill of acquired businesses | 22.8 | 111.4
Goodwill disposed of relating to sales of businesses | 0.0 | (7.7)
Foreign currency translation adjustments during the year | 5.7 | (0.6)
Ending balance | 618.4 | 591.5
Services |  |
Goodwill [Line Items] |  |
Beginning balance | 171.3 | 171.3
Goodwill adjustment during measurement period | 0.0 |
Goodwill of acquired businesses | 0.0 | 0.0
Goodwill disposed of relating to sales of businesses | (44.0) | 0.0
Foreign currency translation adjustments during the year | 0.0 | 0.0
Ending balance | $ 127.3 | $ 171.3

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