Derivative Financial Instruments (Summary of Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income) (Details) - Derivatives in Cash Flow Hedging Relationships [Member] - Interest Rate Swap Contracts [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments Gain Loss [Line Items]
Amount of Gain Recognized in AOCI			$ 21.7	$ 10.7
Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain reclassified from AOCI into net earnings	$ 1.4	$ 2.2	$ 3.5	$ 4.1