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Long-Term Debt (Narrative) (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
type_of_borrowing
business_day
lender
Mar. 31, 2024
Dec. 31, 2023
USD ($)
Short-term Debt [Line Items]      
Total authorized program $ 1,200,000,000   $ 1,200,000,000
Line of credit facility, remaining borrowing capacity $ 443,200,000   331,900,000
Number of types of borrowing that may be elected under the facility | type_of_borrowing 5    
Number of business days' notice to terminate facility | business_day 3    
Line of Credit      
Short-term Debt [Line Items]      
Excess of without planned expenditures $ 750,000,000.0    
Leverage ratio to EBITDA 4.00 3.50  
Secured debt limit, percentage of total consolidated assets 15.00%    
Line of Credit | Debt Covenant 1      
Short-term Debt [Line Items]      
Leverage ratio to EBITDA 3.50    
Line of Credit | Debt Covenant 2      
Short-term Debt [Line Items]      
Leverage ratio to EBITDA 4.00    
Senior Notes | Senior Notes, Due 2024      
Short-term Debt [Line Items]      
Repayments of debt $ 300,000,000.0    
Stated percentage (as a percent) 3.80%    
Revolving credit facility      
Short-term Debt [Line Items]      
Total authorized program $ 1,200,000,000    
Number of lenders in syndicate | lender 12    
Credit facility outstanding $ 0   0
Line of credit facility, remaining borrowing capacity 443,200,000    
Revolving credit facility | Letter of Credit      
Short-term Debt [Line Items]      
Total authorized program 125,000,000.0    
Revolving credit facility | Standby Letters of Credit      
Short-term Debt [Line Items]      
Total authorized program 61,400,000   $ 52,000,000.0
Revolving credit facility | Line of Credit      
Short-term Debt [Line Items]      
Total authorized program $ 1,200,000,000