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Long-term Debt Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2016
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]            
Amortization of financing costs and discounts       $ 2,000,000 $ 2,000,000 $ 2,000,000
Long-term Debt, Gross       $ 350,000,000 $ 351,000,000  
Debt, weighted average interest rate       3.60% 4.90%  
Write off of deferred debt issuance cost       $ 2,000,000    
Payments of debt issuance costs       4,000,000    
Redemption Premium       9,000,000    
Senior unsecured notes, maturing 2024            
Debt Instrument [Line Items]            
Fair value of debt       358,000,000 $ 360,000,000  
Amount of loan issuance       350,000,000    
Long-term Debt, Gross       $ 0 350,000,000  
Debt, interest rate, stated percentage       4.875%    
Debt Instrument, Redemption Price, Percentage     102.438%      
Senior unsecured notes, maturing 2029 | Senior Notes            
Debt Instrument [Line Items]            
Amount of loan issuance $ 350,000,000          
Long-term Debt, Gross       $ 350,000,000 $ 0  
Debt, interest rate, stated percentage 3.625%     3.625%    
Debt Instrument, Redemption Price, Percentage 100.00%          
Debt Instrument, Repurchase Price, Percentage 101.00%          
Debt Instrument, Debt Default, Principal Amount Due, Percentage 25.00%          
Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 550,000,000    
Long-term Line of Credit       $ 0    
Debt Instrument, Covenant Terms, Capitalization Percentage       57.50%    
Amended Credit Facility | Revolving Credit Facility | Letter of Credit            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 60,000,000    
Letter of Credit Facility | Letter of Credit | Line of Credit            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 20,000,000        
Minimum | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, commitment fee percentage       0.20%    
Minimum | Letter of Credit Facility | Letter of Credit | Line of Credit            
Debt Instrument [Line Items]            
Debt Instrument, Fee, Percentage   0.50%        
Maximum | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, commitment fee percentage       0.425%    
Maximum | Letter of Credit Facility | Letter of Credit | Line of Credit            
Debt Instrument [Line Items]            
Debt Instrument, Fee, Percentage   1.875%        
Base Rate | Minimum | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       0.50%    
Base Rate | Maximum | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       1.50%    
London Interbank Offered Rate (LIBOR) | Minimum | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       1.50%    
London Interbank Offered Rate (LIBOR) | Maximum | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       2.50%    
Federal Funds Rate | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       0.50%    
One-Month LIBOR | Amended Credit Facility | Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       1.00%