Derivative Financial Instruments (Schedule of Derivative Offset Amounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative Liability, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag	Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	Net Amounts of Liabilities Presented in the Consolidated Balance Sheets
Exchange Traded
Derivative [Line Items]
Gross Amounts of Recognized Liabilities	$ (18.2)	$ (22.3)
Gross Amounts of Assets Offset in the Consolidated Balance Sheets	9.3	5.1
Derivative Liability, Total	8.9	17.2
Margin Deposit Amounts Not Offset in the Consolidated Balance Sheets	14.8	46.3
Net Amount Offset	$ 5.9	$ 29.1