Hedging Activities and Fair Value Measurements, Derivative Instruments included in the Condensed Consolidated Statements of Comprehensive (Loss) Income (Details) - Interest Rate Swap Contracts [Member] - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gains and Losses on Derivatives Designated as Cash Flow Hedges [Abstract]
(Loss) gain recognized in AOCI on derivatives		$ (4.6)	$ 3.1	$ (7.0)	$ 13.4
Loss reclassified from AOCI into income (effective portion)	[1]	$ (3.9)	$ (3.1)	$ (7.6)	$ (7.9)

[1] Losses on derivatives reclassified from accumulated other comprehensive income (“AOCI”) into income were included within “Interest expense” in the Condensed Consolidated Statements of Operations.