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Financing (Narrative) (Details)
£ in Millions
1 Months Ended 12 Months Ended
Mar. 17, 2023
USD ($)
Feb. 05, 2018
USD ($)
Nov. 30, 2006
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 09, 2024
USD ($)
Dec. 09, 2024
GBP (£)
Debt Instrument [Line Items]                
Repayments of term facility       $ 105,000,000.0 $ 245,000,000.0 $ 0    
Total debt to total capitalization ratio       0.413        
Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Net leverage ratio 3.50              
Maximum net leverage ratio 4.00              
Minimum interest coverage ratio 3.00              
Credit Agreement | Line of Credit | Variable Rate Component One | Minimum                
Debt Instrument [Line Items]                
Credit spread adjustment 0.10%              
Margin rate 1.50%              
Credit Agreement | Line of Credit | Variable Rate Component One | Maximum                
Debt Instrument [Line Items]                
Margin rate 2.25%              
Credit Agreement | Line of Credit | Variable Rate Component Two | Minimum                
Debt Instrument [Line Items]                
Margin rate 0.50%              
Credit Agreement | Line of Credit | Variable Rate Component Two | Maximum                
Debt Instrument [Line Items]                
Margin rate 1.25%              
Credit Agreement | Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 500,000,000              
Credit Agreement | Revolving Credit Facility | Line of Credit | Minimum                
Debt Instrument [Line Items]                
Undrawn commitments fee percentage 0.20%              
Credit Agreement | Revolving Credit Facility | Line of Credit | Maximum                
Debt Instrument [Line Items]                
Undrawn commitments fee percentage 0.35%              
Credit Agreement | Term Facility | Line of Credit                
Debt Instrument [Line Items]                
Increase to line of credit facility             $ 200,000,000  
Maximum borrowing capacity $ 350,000,000           $ 700,000,000  
6.55% notes due November 2036 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument, interest rate     6.55% 6.55% 6.55%      
Debt instrument, term     30 years          
Debt instrument, face amount     $ 200,000,000          
Redemption price percentage     101.00%          
Effective annualized interest rate     6.67%          
4.20% notes due March 2048 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument, interest rate   4.20%   4.20% 4.20%      
Debt instrument, face amount   $ 350,000,000            
Redemption price percentage   101.00%            
Effective annualized interest rate   4.29%            
Letter of Credit Reimbursement Agreement | Standby Letters of Credit | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 176,100,000 $ 190,700,000      
Open standby letters of credit       $ 38,800,000 $ 69,700,000      
The Credit Facility | Term Facility | Line of Credit                
Debt Instrument [Line Items]                
Debt instrument, face amount | £               £ 300