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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,961.8 $ 9,871.8
Goodwill, Accumulated Amortization     (519.2) (534.3)
Goodwill, Net Carrying Value $ 9,337.5 $ 8,976.1 9,442.6 9,337.5
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,104.8 1,248.3
Intangible assets:, Accumulated Amortization     (727.1) (879.9)
Intangible assets:, Net Carrying Value     377.7 368.4
Changes in Goodwill        
Goodwill, January 1 9,337.5 8,976.1    
Goodwill, Acquisitions 164.9 15.8    
Goodwill, Noncontrolling interests in acquired businesses 55.7 14.5    
Goodwill, Contingent purchase price of acquired businesses 57.5 8.5    
Goodwill, Foreign currency translation and other (173.0) 167.1    
Goodwill, June 30 $ 9,442.6 $ 9,182.0    
Purchased and internally developed software        
Intangible assets:        
Intangible assets:, Gross Carrying Value     369.2 368.2
Intangible assets:, Accumulated Amortization     (312.0) (303.0)
Intangible assets:, Net Carrying Value     57.2 65.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     735.6 880.1
Intangible assets:, Accumulated Amortization     (415.1) (576.9)
Intangible assets:, Net Carrying Value     $ 320.5 $ 303.2