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Fair Value Measurements (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition, Contingent Consideration [Line Items]
Loss (gain) on fair value remeasurement of contingent consideration	$ 12.3	$ (62.7)	$ (14.8)
Payments	(101.5)	(6.7)
Fair Value, Measurements, Recurring
Business Acquisition, Contingent Consideration [Line Items]
Fair value, beginning of period	523.6	467.6
Fair value, end of period	$ 409.8	$ 523.6	$ 467.6

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Amount of liability recognized arising from contingent consideration in a business combination.

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