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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,871.8 $ 9,481.4
Goodwill, Accumulated Amortization     (534.3) (505.3)
Goodwill, Net Carrying Value $ 8,976.1 $ 8,676.4 9,337.5 8,976.1
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,248.3 1,205.0
Intangible assets:, Accumulated Amortization     (879.9) (777.6)
Intangible assets:, Net Carrying Value     368.4 427.4
Changes in Goodwill        
Goodwill, January 1 8,976.1 8,676.4    
Goodwill, Acquisitions 19.3 311.7    
Goodwill, Noncontrolling interests in acquired businesses 18.9 74.0    
Goodwill, Contingent purchase price obligations of acquired businesses 27.1 152.8    
Goodwill, Foreign currency translation and other 296.1 (238.8)    
Goodwill, December 31 9,337.5 8,976.1    
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     368.2 342.6
Intangible assets:, Accumulated Amortization     (303.0) (270.2)
Intangible assets:, Net Carrying Value     65.2 72.4
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     880.1 862.4
Intangible assets:, Accumulated Amortization     (576.9) (507.4)
Intangible assets:, Net Carrying Value     $ 303.2 $ 355.0