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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,796.2 $ 9,898.6
Goodwill, Accumulated Amortization     (504.8) (514.3)
Goodwill, Net Carrying Value $ 9,384.3 $ 9,337.5 9,291.4 9,384.3
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,087.7 1,120.2
Intangible assets:, Accumulated Amortization     (753.2) (737.4)
Intangible assets:, Net Carrying Value     334.5 382.8
Changes in Goodwill        
Goodwill, January 1 9,384.3 9,337.5    
Goodwill, Acquisitions 8.9 232.5    
Goodwill, Noncontrolling interests in acquired businesses 17.2 111.7    
Goodwill, Contingent purchase price of acquired businesses 24.7 60.2    
Goodwill, Dispositions (19.1) (141.9)    
Goodwill, Foreign currency translation (124.6) (179.7)    
Goodwill, September 30 $ 9,291.4 $ 9,420.3    
Purchased and internally developed software        
Intangible assets:        
Intangible assets:, Gross Carrying Value     352.3 356.4
Intangible assets:, Accumulated Amortization     (297.5) (302.2)
Intangible assets:, Net Carrying Value     54.8 54.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     735.4 763.8
Intangible assets:, Accumulated Amortization     (455.7) (435.2)
Intangible assets:, Net Carrying Value     $ 279.7 $ 328.6