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Assets and Liabilities Measured at Fair Value (Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt, excluding finance leases $ (1,673.1) $ (1,673.3)
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Current and long-term debt, excluding finance leases $ (1,644.8) $ (1,643.0)