Derivative Financial Instruments (Summary of Amount of Loss Recognized in Accumulated Other Comprehensive Income) (Details) - Derivatives in Cash Flow Hedging Relationships [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments Gain Loss [Line Items]
Amount of (Loss) Recognized in AOCI			$ (12.9)	$ (22.9)
Gain (Loss) Reclassified from AOCI into Net Earnings (Loss)	$ 1.9	$ (0.5)	3.7	(1.5)
Interest Rate Swap Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of (Loss) Recognized in AOCI			(12.9)	(22.9)
Interest Rate Swap Contracts [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Net Earnings (Loss)	$ 1.9	$ (0.5)	$ 3.7	$ (1.5)