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Fair Value Measurements (Details 2) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Contingent consideration | $ (20.0) | $ 1.9 | $ (8.5) | $ (3.7)
Payments | 0.0 | 0.0 | 0.0 | (20.0)
Fair Value, Measurements, Recurring |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Fair value, beginning of period | 421.3 | 498.0 | 409.8 | 523.6
Fair value, end of period | $ 401.3 | $ 499.9 | $ 401.3 | $ 499.9

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