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Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Short-term borrowings and current maturities of long-term debt $ 952.2 $ 801.9
Debentures With Put Feature [Member]    
Short-term borrowings and current maturities of long-term debt 295.0 295.0
Commercial Paper [Member]    
Short-term borrowings and current maturities of long-term debt 0.0 0.0
Three Point Five Five Percent Senior Notes due 2024 [Member]    
Short-term borrowings and current maturities of long-term debt $ 500.0 $ 499.4
Debt Instrument, Interest Rate, Stated Percentage 3.55% 3.55%
Six Point Four Eight Percent Debenture Due Two Thousand Twenty Five    
Debt Instrument, Interest Rate, Stated Percentage 6.48% 6.48%
6.48% Debentures Due 2025 [Member]    
Short-term borrowings and current maturities of long-term debt $ 149.7 $ 0.0
Seven Point Two Zero Percent Debentures [Domain]    
Short-term borrowings and current maturities of long-term debt $ 7.5 $ 7.5
Debt Instrument, Interest Rate, Stated Percentage 7.20% 7.20%
6.48% Debentures Due 2025 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 6.48% 6.48%
Seven Point Two Zero Percent Debentures [Domain]    
Debt Instrument, Interest Rate, Stated Percentage 7.20% 7.20%