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Financial Instruments (Narrative) (Details)
Mar. 30, 2022
Oct. 27, 2020
USD ($)
Nov. 07, 2017
USD ($)
Mar. 31, 2023
USD ($)
Mar. 16, 2023
USD ($)
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       1.47        
Interest coverage ratio       14.76        
Line of Credit                
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       $ 491,000,000        
Basis spread on variable rate 1.625%              
Line of credit facility, remaining borrowing capacity       $ 209,000,000        
Line of Credit | Interest Rate Swap                
Debt Instrument [Line Items]                
Derivative, notional amount         $ 350,000,000   $ 350,000,000 $ 350,000,000
Derivative, fixed interest rate             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         4.73%      
Line of Credit | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.50%              
Line of Credit | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.00%