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Business Acquisitions (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 928.5 $ 874.7 $ 800.4
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Tangible assets acquired 36.8    
Intangible assets 81.7    
Goodwill 55.3    
Liabilities assumed (10.6)    
TOTAL CASH CONSIDERATION $ 163.2