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Financial Instruments (Narrative) (Details)
12 Months Ended
Dec. 16, 2021
Oct. 27, 2020
USD ($)
Nov. 07, 2017
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 16, 2022
USD ($)
Oct. 17, 2022
USD ($)
Jun. 14, 2021
USD ($)
Debt Instrument [Line Items]                  
Current maturities of long-term debt       $ 0 $ 0        
Principal payments due on long-term debt in two years       439,000,000          
Cash payments of interest       $ 16,000,000 $ 14,900,000 $ 15,100,000      
Maximum leverage ratio allowed       3.50          
Minimum interest coverage ratio required       3.00          
Leverage ratio       1.25          
Interest coverage ratio       15.17          
Interest Rate Swap                  
Debt Instrument [Line Items]                  
Cash collateral received       $ 0          
Cash collateral pledged       0          
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       439,000,000          
Basis spread on variable rate 1.625%                
Line of credit facility, remaining borrowing capacity       $ 261,000,000          
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 3.735%             2.11% 0.838%
LIBOR rate             2.463%    
Line of Credit | Interest Rate Swap | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Derivative, basis spread on variable rate 4.33%                
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%