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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill, Gross Carrying Value $ 10,199.0   $ 10,259.6
Goodwill, Accumulated Amortization (497.2)   (521.0)
Goodwill, Net Carrying Value 9,701.8 $ 9,723.2 9,738.6
Intangible assets:      
Intangible assets:, Gross Carrying Value 1,147.1   1,154.5
Intangible assets:, Accumulated Amortization (815.6)   (856.5)
Intangible assets:, Net Carrying Value 331.5   298.0
Changes in Goodwill      
Goodwill, January 1 9,738.6 9,609.7  
Goodwill, Acquisitions 201.1 17.8  
Goodwill, Noncontrolling interests in acquired businesses 47.9 37.3  
Goodwill, Contingent purchase price obligations of acquired businesses 0.0 88.0  
Goodwill, Dispositions (19.6) (21.6)  
Goodwill, Foreign currency translation (266.2) (8.0)  
Goodwill, March 31 9,701.8 $ 9,723.2  
Purchased and internally developed software      
Intangible assets:      
Intangible assets:, Gross Carrying Value 370.0   382.2
Intangible assets:, Accumulated Amortization (311.7)   (318.7)
Intangible assets:, Net Carrying Value 58.3   63.5
Customer related and other      
Intangible assets:      
Intangible assets:, Gross Carrying Value 777.1   772.3
Intangible assets:, Accumulated Amortization (503.9)   (537.8)
Intangible assets:, Net Carrying Value $ 273.2   $ 234.5