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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition, Contingent Consideration [Line Items]        
Additions   $ 274.5 $ 0.0  
(Gain) loss on fair value remeasurement of contingent consideration $ (49.4) 30.5 (38.9) $ (0.5)
Payments   (14.5) (26.5)  
Fair Value, Measurements, Recurring        
Business Acquisition, Contingent Consideration [Line Items]        
Fair value, beginning of period   215.5 280.9  
Fair value, end of period   $ 506.0 $ 215.5 $ 280.9