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Fair Value Measurements (Details 2) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition, Contingent Consideration [Line Items] |  |
Contingent consideration | $ 11.5 | $ (5.6)
Payments | 0.0 | (20.0)
Fair Value, Measurements, Recurring |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Fair value, beginning of period | 409.8 | 523.6
Fair value, end of period | $ 421.3 | $ 498.0

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