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Debt - Narrative (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2017
Jan. 31, 2009
Debt Instrument [Line Items]        
Collection of sold receivables $ 24,000,000 $ 27,000,000    
Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Credit limit 450,000,000 450,000,000    
Line of credit outstanding $ 75,000,000 $ 0    
Line of Credit | Revolving Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Variable rate percentage 3.50% 3.50%    
Commitment fee percentage 0.25%      
7.5% Term Loan due November 30, 2022 | Notes Payable, Other Payables        
Debt Instrument [Line Items]        
Principal amount       $ 2,000,000,000
Stated interest rate (as percent) 7.50%     7.50%
Long-term debt, gross $ 139,000,000 $ 139,000,000    
Fair value of long-term debt $ 183,000,000 182,000,000    
Debt forgiven   300,000,000    
5.0% Daylight Term Loan due October 15, 2024 | Notes Payable, Other Payables        
Debt Instrument [Line Items]        
Principal amount     $ 137,500,000  
Stated interest rate (as percent) 5.00%      
Long-term debt, gross $ 98,000,000 98,000,000    
Financial Institution Credit Facilities | Line of Credit        
Debt Instrument [Line Items]        
Credit limit 60,000,000 60,000,000    
Letters of credit outstanding 31,000,000 31,000,000    
Financial Institution Credit Facilities | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Credit limit 15,000,000      
Line of credit outstanding $ 0 $ 0    
Financial Institution Credit Facilities | Line of Credit | Revolving Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Variable rate percentage 0.50%