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Debt and Credit Facilities (Narrative) (Details) - USD ($)
$ in Millions
Nov. 30, 2025
Mar. 31, 2025
Feb. 28, 2025
Dec. 31, 2024
Long-term debt excluding current maturities   $ 3,919.6   $ 4,318.1
Short-term borrowings and current maturities of long-term debt   851.7   452.2
Debt Instrument, Fair Value Disclosure   4,700.0   4,600.0
Commercial Paper [Member]        
Short-term borrowings and current maturities of long-term debt   0.0   0.0
Debentures With Put Feature [Member]        
Short-term borrowings and current maturities of long-term debt   295.0   295.0
Debentures with put option available to be exercised $ 257.8   $ 37.2  
Three Point Five Percent Senior notes Due Two Thousand Twenty Six [Member]        
Long-term debt excluding current maturities   $ 0.0   $ 399.4
Debt Instrument, Interest Rate, Stated Percentage   3.50%   3.50%
Three Point Eight Percent Senior Notes Due Two Thousand Twenty Nine [Member]        
Long-term debt excluding current maturities   $ 747.3   $ 747.1
Debt Instrument, Interest Rate, Stated Percentage   3.80%   3.80%
Four Point Five Percent Senior Notes Due Two Thousand Forty Nine [Member]        
Long-term debt excluding current maturities   $ 346.4   $ 346.3
Debt Instrument, Interest Rate, Stated Percentage   4.50%   4.50%
5.75% Senior notes due 2043 [Member]        
Long-term debt excluding current maturities   $ 495.7   $ 495.7
Debt Instrument, Interest Rate, Stated Percentage   5.75%   5.75%
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]        
Long-term debt excluding current maturities   $ 296.8   $ 296.7
Debt Instrument, Interest Rate, Stated Percentage   4.65%   4.65%
Commercial Paper [Member]        
Line of credit facility, amount outstanding   $ 2,000.0    
Revolving Credit Facility [Member]        
Line of Credit Facility, Remaining Borrowing Capacity   2,000.0   $ 2,000.0
2026 Revolving Credit Facility        
Line of credit facility, amount outstanding   1,000.0    
2027 Revolving Credit Facility        
Line of credit facility, amount outstanding   $ 1,000.0