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Fair Value Measurements (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on fair value remeasurement of contingent consideration | $ (2.6) | $ 57.8 | $ 20.0 | $ (11.5) | $ (79.3) | $ 87.9 | $ (1.9) | $ 5.6 | $ 63.7 | $ 12.3 | $ (62.7)
Payments |  |  |  |  |  |  |  |  | 0.0 | (101.5) |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period |  |  |  | $ 409.8 |  |  |  | $ 523.6 | 409.8 | 523.6 |
Fair value, end of period | $ 346.1 |  |  |  | $ 409.8 |  |  |  | $ 346.1 | $ 409.8 | $ 523.6

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