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Fair Value Measurements (Details 2) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration impairment	$ 57.8		$ 87.9	$ 66.3	$ 91.6
Payments	0.0	$ (81.5)	0.0	0.0	(20.0)
Fair Value, Measurements, Recurring
Business Acquisition, Contingent Consideration [Line Items]
Fair value, beginning of period	401.3	412.0	499.9	409.8	523.6
Fair value, end of period	$ 343.5	$ 409.8	$ 412.0	$ 343.5	$ 412.0

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- Definition

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

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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