Financial Instruments, Hedging Activities and Fair Value Measurements - Derivative Locations and Amounts Recognized (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (loss) gain on derivatives	$ (4.6)	$ 3.6	$ (39.5)	$ 16.2
Interest Expense [Member] | Foreign Exchange Forward [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	2.3	(3.0)	4.1	(7.6)
Cash Flow Hedging [Member] | Interest Rate Cap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (loss) gain on derivatives	0.3	(1.1)	6.2	(11.5)
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (loss) gain on derivatives	4.8	(2.5)	32.4	(5.0)
Cash Flow Hedging [Member] | Currency Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (loss) gain on derivatives	(24.2)	5.5	(39.1)	(18.4)
Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Cap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of (Gain) Loss Recognized in Income	0.1	(0.7)	(1.5)	(1.4)
Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of (Gain) Loss Recognized in Income	0.4	0.5	0.5	0.9
Cash Flow Hedging [Member] | Interest Expense [Member] | Currency Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of (Gain) Loss Recognized in Income	$ (3.8)	$ (3.2)	$ (11.0)	$ (5.9)