Derivative Financial Instruments and Fair Value Measurements - Effect of Net Investment Hedges and Cross-Currency Swaps on AOCI (Details) - Net Investment Hedging - Designated as hedging instrument - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Euro-denominated notes
Derivative [Line Items]
Gain(Loss) Recognized in Other Comprehensive Income	$ (13.9)	$ 47.1	$ 8.5	$ 25.9
Cross-currency swap
Derivative [Line Items]
Gain(Loss) Recognized in Other Comprehensive Income	5.0		5.0
Cross-currency swap | Interest and Other (Income) Expenses, Net
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income	$ 5.4		$ 5.4