Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) derivative_instrument	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) derivative_instrument	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) derivative_instrument
Derivative [Line Items]
Interest expense, net of interest income	$ (44.9)	$ (37.4)	$ (120.2)	$ (112.8)
Designated
Derivative [Line Items]
Pre-tax gain (loss) included in accumulated other comprehensive loss for interest rate derivatives			165.5		$ 74.5
Pre-tax losses reclassified during the next twelve months			$ 37.4
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 on derivative instruments	$ 2.1	1.6	$ 2.3	1.5
Notional amount	538.8		538.8		$ 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	$ 10.0	$ 1.9	$ 13.1	$ 7.4