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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition, Contingent Consideration [Line Items]        
Additions $ 0.0 $ 0.0 $ 0.0 $ 0.0
Changes in fair value 21.2 10.6 31.2 12.9
Payments 0.0 (3.2) (6.7) (3.2)
Fair Value, Measurements, Recurring        
Business Acquisition, Contingent Consideration [Line Items]        
Fair value, beginning of period 470.9 508.3 467.6 506.0
Fair value, end of period $ 492.1 $ 515.7 $ 492.1 $ 515.7