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Business Acquisitions (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 1,058.7 $ 991.0
Series of Individually Immaterial Business Acquisitions    
Business Acquisition [Line Items]    
Tangible assets acquired 21.4  
Intangible assets 31.5  
Goodwill 60.1  
Net deferred taxes (0.4)  
Other liabilities assumed (12.4)  
TOTAL CONSIDERATION, NET OF CASH RECEIVED $ 100.2