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		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gains and Losses on Derivatives Designated as Cash Flow Hedges [Abstract]
Gain (loss) recognized in AOCI on derivatives (effective portion)	[1]	$ 1.4	$ 0.3	$ (4.9)	$ (29.8)
Loss reclassified from AOCI into income (effective portion)	[1]	(4.1)	(1.7)	(13.9)	(8.1)
(Loss) gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing)	[1]	$ (2.1)	$ (0.6)	$ (2.1)	$ 0.2

[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. Ineffective portions of changes in the fair value of cash flow hedges were recognized in earnings and included in "Interest expense" in the Condensed Consolidated Statements of Operations.