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Long-Term Debt (Narrative) (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
borrowing_type
business_day
lender
Dec. 31, 2024
USD ($)
Jul. 31, 2025
USD ($)
Line of Credit      
Short-term Debt [Line Items]      
Excess of without planned expenditures $ 750,000,000.0    
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]      
Stated percentage (as a percent)   3.80%  
Repayments of debt   $ 300,000,000.0  
Revolving credit facility      
Short-term Debt [Line Items]      
Letters of credit issued under the credit agreement $ 0 0  
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 93,200,000 61,400,000  
Revolving credit facility | Line of Credit      
Short-term Debt [Line Items]      
Total authorized program $ 1,000,000,000 1,200,000,000 $ 1,200,000,000
Number of lenders in syndicate | lender 10    
Letters of credit issued under the credit agreement $ 0 0  
Total program available $ 709,000,000.0 443,200,000  
Number of types of borrowing that may be elected under the facility | borrowing_type 5    
Number of business days' notice to terminate facility | business_day 3    
Credit facility outstanding $ 0 $ 0