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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,956.5 $ 9,957.5
Goodwill, Accumulated Amortization     (518.1) (517.0)
Goodwill, Net Carrying Value $ 9,440.5 $ 9,291.4 9,438.4 9,440.5
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,087.3 1,097.4
Intangible assets:, Accumulated Amortization     (781.1) (759.2)
Intangible assets:, Net Carrying Value     306.2 338.2
Changes in Goodwill        
Goodwill, January 1 9,440.5 9,384.3    
Goodwill, Acquisitions 46.1 8.9    
Goodwill, Noncontrolling interests in acquired businesses 32.4 17.2    
Goodwill, Contingent purchase price obligations of acquired businesses 0.0 24.7    
Goodwill, Dispositions (3.3) (19.1)    
Goodwill, Foreign currency translation (77.3) (124.6)    
Goodwill, September 30 $ 9,438.4 $ 9,291.4    
Purchased and internally developed software        
Intangible assets:        
Intangible assets:, Gross Carrying Value     366.8 350.7
Intangible assets:, Accumulated Amortization     (299.0) (288.5)
Intangible assets:, Net Carrying Value     67.8 62.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     720.5 746.7
Intangible assets:, Accumulated Amortization     (482.1) (470.7)
Intangible assets:, Net Carrying Value     $ 238.4 $ 276.0