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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,957.5 $ 9,898.6
Goodwill, Accumulated Amortization     (517.0) (514.3)
Goodwill, Net Carrying Value $ 9,384.3 $ 9,384.3 9,440.5 9,384.3
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,097.4 1,120.2
Intangible assets:, Accumulated Amortization     (759.2) (737.4)
Intangible assets:, Net Carrying Value     338.2 382.8
Changes in Goodwill        
Goodwill, January 1 9,384.3 9,337.5    
Goodwill, Acquisitions 5.5 250.6    
Goodwill, Noncontrolling interests in acquired businesses 17.2 112.0    
Goodwill, Contingent purchase price obligations of acquired businesses 24.7 60.0    
Goodwill, Dispositions (19.1) (143.6)    
Goodwill, Foreign currency translation 27.9 (232.2)    
Goodwill, December 31 9,440.5 9,384.3    
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     350.7 356.4
Intangible assets:, Accumulated Amortization     (288.5) (302.2)
Intangible assets:, Net Carrying Value     62.2 54.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     746.7 763.8
Intangible assets:, Accumulated Amortization     (470.7) (435.2)
Intangible assets:, Net Carrying Value     $ 276.0 $ 328.6