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Financial Instruments (Narrative) (Details)
Jun. 23, 2023
Jun. 16, 2023
USD ($)
Oct. 27, 2020
USD ($)
Nov. 07, 2017
USD ($)
Jun. 30, 2023
USD ($)
Jun. 29, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 17, 2022
USD ($)
Jun. 14, 2021
USD ($)
Debt Instrument [Line Items]                  
Current maturities of long-term debt         $ 0   $ 0    
Maximum leverage ratio allowed         3.50        
Minimum interest coverage ratio required         3.00        
Leverage ratio         1.49        
Interest coverage ratio         14.36        
Line of Credit | Unsecured Debt                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 700,000,000 $ 685,000,000          
Debt instrument, term     4 years 5 years          
Borrowings outstanding         $ 487,000,000        
Line of credit facility, remaining borrowing capacity         $ 213,000,000        
Line of Credit | SOFR | Minimum | Unsecured Debt                  
Debt Instrument [Line Items]                  
Total spread 0.00%                
Line of Credit | London Interbank Offered Rate | Unsecured Debt                  
Debt Instrument [Line Items]                  
Total spread   1.625%              
Line of Credit | Interest Rate Swap                  
Debt Instrument [Line Items]                  
Derivative, notional amount   $ 350,000,000       $ 350,000,000   $ 350,000,000 $ 350,000,000
Derivative, fixed interest rate           0.7683%   2.11% 0.838%
All-in interest rate   2.463%           3.735%  
Line of Credit | Interest Rate Swap | London Interbank Offered Rate                  
Debt Instrument [Line Items]                  
Derivative, basis spread on variable rate   5.16%