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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition, Contingent Consideration [Line Items]        
Additions $ 0.0 $ 0.0 $ 0.0 $ 274.5
Changes in fair value 5.9 0.2 18.8 5.9
Payments 0.0 (14.5) (3.2) (14.5)
Fair Value, Measurements, Recurring        
Business Acquisition, Contingent Consideration [Line Items]        
Fair value, beginning of period 515.7 495.7 506.0 215.5
Fair value, end of period $ 521.6 $ 481.4 $ 521.6 $ 481.4