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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition, Contingent Consideration [Line Items]        
Additions $ 0.0 $ 36.0 $ 0.0 $ 274.5
Changes in fair value 10.6 (2.2) 12.9 5.6
Payments (3.2) 0.0 (3.2) 0.0
Fair Value, Measurements, Recurring        
Business Acquisition, Contingent Consideration [Line Items]        
Fair value, beginning of period 508.3 461.8 506.0 215.5
Fair value, end of period $ 515.7 $ 495.6 $ 515.7 $ 495.6