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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,893.3 $ 9,898.6
Goodwill, Accumulated Amortization     (514.5) (514.3)
Goodwill, Net Carrying Value $ 9,384.3 $ 9,337.5 9,378.8 9,384.3
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,107.3 1,120.2
Intangible assets:, Accumulated Amortization     (739.4) (737.4)
Intangible assets:, Net Carrying Value     367.9 382.8
Changes in Goodwill        
Goodwill, January 1 9,384.3 9,337.5    
Goodwill, Acquisitions 0.5 113.0    
Goodwill, Noncontrolling interests in acquired businesses 0.8 55.3    
Goodwill, Contingent purchase price of acquired businesses 0.2 57.3    
Goodwill, Dispositions (19.0) (0.3)    
Goodwill, Foreign currency translation 12.0 72.6    
Goodwill, March 31 $ 9,378.8 $ 9,635.4    
Purchased and internally developed software        
Intangible assets:        
Intangible assets:, Gross Carrying Value     355.9 356.4
Intangible assets:, Accumulated Amortization     (303.3) (302.2)
Intangible assets:, Net Carrying Value     52.6 54.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     751.4 763.8
Intangible assets:, Accumulated Amortization     (436.1) (435.2)
Intangible assets:, Net Carrying Value     $ 315.3 $ 328.6