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Acquisitions (Details) (USD $)
In Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Acquisitions [Abstract]                
Amount of cash consideration paid for acquisitions $ 15.2 $ 258.5            
Estimated amortization expense, remainder of the current fiscal year               19.9
Estimated amortization expense, Year 1             34.6  
Estimated amortization expense, Year 2           29.8    
Estimated amortization expense, Year 3         24.6      
Estimated amortization expense, Year 4       21.3        
Estimated amortization expense, Year 5     $ 18.1