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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, Gross Carrying Value     $ 9,878.3 $ 9,898.6
Goodwill, Accumulated Amortization     (513.6) (514.3)
Goodwill, Net Carrying Value $ 9,364.7 $ 9,337.5 9,364.7 9,384.3
Intangible assets:        
Intangible assets:, Gross Carrying Value     1,101.7 1,120.2
Intangible assets:, Accumulated Amortization     (748.2) (737.4)
Intangible assets:, Net Carrying Value     353.5 382.8
Changes in Goodwill        
Goodwill, January 1 9,384.3 9,337.5    
Goodwill, Acquisitions 0.5 164.9    
Goodwill, Noncontrolling interests in acquired businesses 0.7 55.7    
Goodwill, Contingent purchase price of acquired businesses 0.2 57.5    
Goodwill, Dispositions (19.1) (0.8)    
Goodwill, Foreign currency translation (1.9) (172.2)    
Goodwill, June 30 $ 9,364.7 $ 9,442.6    
Purchased and internally developed software        
Intangible assets:        
Intangible assets:, Gross Carrying Value     352.3 356.4
Intangible assets:, Accumulated Amortization     (298.9) (302.2)
Intangible assets:, Net Carrying Value     53.4 54.2
Customer related and other        
Intangible assets:        
Intangible assets:, Gross Carrying Value     749.4 763.8
Intangible assets:, Accumulated Amortization     (449.3) (435.2)
Intangible assets:, Net Carrying Value     $ 300.1 $ 328.6