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
		Mar. 31, 2019	Mar. 31, 2018
Gains and Losses on Derivatives Designated as Cash Flow Hedges [Abstract]
(Loss) gain recognized in AOCI on derivatives		$ (2.4)	$ 10.3
Loss reclassified from AOCI into income (effective portion)	[1]	$ (3.7)	$ (4.8)

[1] Losses on derivatives reclassified from accumulated other comprehensive income ("AOCI") into income (effective portion) were included in "Interest expense" in the Condensed Consolidated Statements of Operations, the same income statement line item as the earnings effect of the hedged item.