Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020 USD ($) derivative_instrument	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) derivative_instrument	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) derivative_instrument
Derivative [Line Items]
Interest expense, net of interest income	$ (38.8)		$ (38.2)	$ (75.3)	$ (75.4)
Designated
Derivative [Line Items]
Pre-tax gain (loss) included in accumulated other comprehensive loss for interest rate derivatives		$ 74.5		174.9
Pre-tax losses reclassified during the next twelve months				$ 36.3
Designated | Interest rate hedge
Derivative [Line Items]
Number of derivative instruments held | derivative_instrument	5			5
Non-Designated | Foreign currency forward contracts
Derivative [Line Items]
Number of derivative instruments held | derivative_instrument	21			21		23
Gain (loss) on derivative instruments	$ 0.6		(0.7)	$ 0.2	(0.1)
Notional amount	543.4			543.4		$ 498.2
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Hedging (Losses) Gains | Interest rate hedge
Derivative [Line Items]
Interest expense, net of interest income	$ 1.6		$ 2.9	$ 3.1	$ 5.5