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Long-Term Debt And Commercial Paper (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Feb. 24, 2025
Debt Instrument [Line Items]      
Letters of credit, amount outstanding $ 0.8    
Commercial paper, maximum aggregate amount outstanding permitted 1,900.0    
Commercial paper, amount outstanding $ 340.0 $ 630.0  
Commercial Paper      
Debt Instrument [Line Items]      
Weighted-average annual interest rate 4.80% 4.90%  
Maximum | Commercial Paper      
Debt Instrument [Line Items]      
Maturity period of debt 397 days    
Weighted Average | Commercial Paper      
Debt Instrument [Line Items]      
Maturity period of debt 1 day 9 days  
Revolving Credit Facility Due 2028      
Debt Instrument [Line Items]      
Maximum borrowing capacity under revolving credit facility $ 1,900.0    
Additional borrowing capacity under accordion feature of revolving credit facility 500.0    
Revolving credit facilities letter of credit sublimit 200.0    
Unused capacity 1,899.2    
Remaining borrowing capacity $ 1,857.6    
Revolving Credit Facility Due 2028 | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Credit spread adjustment on SOFR borrowings under our revolving credit facility 0.10%    
Revolving Credit Facility Due 2028 | Minimum      
Debt Instrument [Line Items]      
Commitment fee on undrawn amounts (percent) 0.125%    
Revolving Credit Facility Due 2028 | Maximum      
Debt Instrument [Line Items]      
Commitment fee on undrawn amounts (percent) 0.20%    
Line of Credit | Revolving Credit Facility Due 2028 | Minimum | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Basis spread on variable interest rates (percent) 1.125%    
Line of Credit | Revolving Credit Facility Due 2028 | Minimum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable interest rates (percent) 0.125%    
Line of Credit | Revolving Credit Facility Due 2028 | Maximum | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Basis spread on variable interest rates (percent) 1.50%    
Line of Credit | Revolving Credit Facility Due 2028 | Maximum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable interest rates (percent) 0.50%    
Recourse | Revolving Credit Facility Due 2028      
Debt Instrument [Line Items]      
Revolving credit facility, amount outstanding $ 0.0 $ 0.0  
Recourse | Other Debt      
Debt Instrument [Line Items]      
Finance leases and other debt obligations included in long-term debt $ 344.5 $ 350.0  
Recourse | Senior Notes | 5.89% Senior Notes      
Debt Instrument [Line Items]      
Aggregate principal amount     $ 500.0
Percentage interest on debt instrument 5.89%    
Senior notes, aggregate offering price percentage     99.995%
Maturity Date Mar. 15, 2035    
Recourse | Line of Credit | Revolving Credit Facility Due 2028      
Debt Instrument [Line Items]      
Maturity Date Jul. 18, 2028