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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]    
Additions $ 0.0 $ 238.5
Changes in fair value 2.3 7.8
Payments 0.0 0.0
Fair Value, Measurements, Recurring    
Business Acquisition, Contingent Consideration [Line Items]    
Fair value, beginning of period 506.0 215.5
Fair value, end of period $ 508.3 $ 461.8