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Debt and Credit Facilities (Long-Term Debt Excluding Current Maturities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt instrument, interest rate 7.20%  
Long-term Debt, Excluding Current Maturities $ 4,318.1 $ 3,977.9
7.20% Debentures Due 2014-2025 [Member]    
Debt instrument, interest rate 7.20% 7.20%
Long-term Debt, Excluding Current Maturities $ 0.0 $ 7.5
6.48% Debentures Due 2025 [Member]    
Debt instrument, interest rate 6.48% 6.48%
Long-term Debt, Excluding Current Maturities $ 0.0 $ 149.7
Three Point Five Percent Senior notes Due Two Thousand Twenty Six [Member]    
Debt instrument, interest rate 3.50% 3.50%
Long-term Debt, Excluding Current Maturities $ 399.4 $ 398.9
Three Point Seven Five Percent Senior Notes Due Two Thousand Twenty Eight [Member]    
Debt instrument, interest rate 3.75% 3.75%
Long-term Debt, Excluding Current Maturities $ 547.9 $ 547.3
Three Point Eight Percent Senior Notes Due Two Thousand Twenty Nine [Member]    
Debt instrument, interest rate 3.80% 3.80%
Long-term Debt, Excluding Current Maturities $ 747.1 $ 746.4
5.750% Senior Notes Due 2043 [Member]    
Debt instrument, interest rate 5.75% 5.75%
Long-term Debt, Excluding Current Maturities $ 495.7 $ 495.4
4.650% Percent Senior Notes due Twenty Forty Four [Member]    
Debt instrument, interest rate 4.65% 4.65%
Long-term Debt, Excluding Current Maturities $ 296.7 $ 296.6
Four Point Three Percent Senior Notes Due Two Thousand Forty Eight [Member]    
Debt instrument, interest rate 4.30% 4.30%
Long-term Debt, Excluding Current Maturities $ 296.7 $ 296.6
Four Point Five Percent Senior Notes Due Two Thousand Forty Nine [Member]    
Debt instrument, interest rate 4.50% 4.50%
Long-term Debt, Excluding Current Maturities $ 346.3 $ 346.2
Five point Twenty-Five Percent Senior Notes Due Two Thousand Thirty Three    
Debt instrument, interest rate 5.25% 5.25%
Long-term Debt, Excluding Current Maturities $ 694.0 $ 693.3
Five point one zero percent senior notes due two thousand thirty-four    
Debt instrument, interest rate 5.10% 5.10%
Long-term Debt, Excluding Current Maturities $ 494.3 $ 0.0