Derivative Financial Instruments (Summary of Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments Gain Loss [Line Items]
Amount of Gain Recognized in AOCI	$ (12.1)	$ 24.9	$ 13.4
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Derivatives in Cash Flow Hedging Relationships [Member] | Interest Rate Swap Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain Recognized in AOCI	$ (0.6)	$ 26.9	$ 21.9
Gain reclassified from AOCI into net earnings	$ 11.5	$ 2.0	$ 8.5