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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 10,141.6 $ 9,957.5
Goodwill, Accumulated Amortization     (531.9) (517.0)
Goodwill, Net Carrying Value $ 9,609.7 $ 9,384.3 9,609.7 9,440.5
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,115.7 1,097.4
Intangible assets:, Accumulated Amortization     (817.2) (759.2)
Intangible assets:, Net Carrying Value     298.5 338.2
Changes in Goodwill        
Goodwill, January 1 9,440.5 9,384.3    
Goodwill, Acquisitions 50.8 5.5    
Goodwill, Noncontrolling interests in acquired businesses 31.6 17.2    
Goodwill, Contingent purchase price obligations of acquired businesses 0.0 24.7    
Goodwill, Dispositions (18.8) (19.1)    
Goodwill, Foreign currency translation 105.6 27.9    
Goodwill, December 31 9,609.7 9,440.5    
Goodwill, impairment losses $ 0.0 $ 0.0    
Goodwill, accumulated impairment losses     0.0  
Purchased and internally developed software        
Intangible assets:        
Intangible assets:, Gross Carrying Value     377.6 350.7
Intangible assets:, Accumulated Amortization     (307.0) (288.5)
Intangible assets:, Net Carrying Value     70.6 62.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     738.1 746.7
Intangible assets:, Accumulated Amortization     (510.2) (470.7)
Intangible assets:, Net Carrying Value     $ 227.9 $ 276.0