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FINANCING ARRANGEMENTS - Current Description of Senior Secured Credit Facilities (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Federal funds effective rate 26.90% 26.90% 26.90%
Revolving credit facility      
Debt Instrument [Line Items]      
Quarterly amortization payments $ 405,000,000    
Incremental credit facility borrowings $ 1,000,000,000    
Incremental borrowings interest rate 28.50%    
Secured leverage ratio (not greater than) 4.00    
Interest coverage ratio (not less than) 2.00    
Revolving credit facility | Secured Debt      
Debt Instrument [Line Items]      
Secured leverage ratio (not greater than) 3.50    
Revolving credit facility | Unsecured Debt      
Debt Instrument [Line Items]      
Total leverage ratio (not greater than) 6.50    
Senior Secured Credit Facilities      
Debt Instrument [Line Items]      
Percentage of net cash proceeds of insurance and condemnation proceeds for property or asset losses 100.00%    
Percentage of cash proceeds from incurrence of debt 100.00%    
Percentage of annual excess cash flow 50.00%    
Percentage of cash proceeds from asset sales outside the ordinary course of business payable as mandatory prepayments 100.00%    
Senior Credit Facilities      
Debt Instrument [Line Items]      
Variable interest rate 0.00%    
2023 Revolving Credit Facility Due June 2023 | Revolving credit facility      
Debt Instrument [Line Items]      
Stated interest rate 3.15%    
2023 Revolving Credit Facility Due June 2023 | Minimum | Revolving credit facility      
Debt Instrument [Line Items]      
Commitment fee, unutilized commitments, percentage 0.25%    
2023 Revolving Credit Facility Due June 2023 | Maximum | Revolving credit facility      
Debt Instrument [Line Items]      
Commitment fee, unutilized commitments, percentage 0.50%    
Term Loan B Facility Due June 2025      
Debt Instrument [Line Items]      
Stated interest rate 3.15%    
Annual amortization rate, percentage 5.00%    
Term Loan B Facility Due November 2025      
Debt Instrument [Line Items]      
Stated interest rate 2.90%    
Annual amortization rate, percentage 5.00%    
Federal Funds Effective Swap Rate | Senior Secured Credit Facilities      
Debt Instrument [Line Items]      
Variable interest rate 0.50%    
Eurodollar | Senior Credit Facilities      
Debt Instrument [Line Items]      
Variable interest rate 1.00%    
Eurodollar | Senior Credit Facilities | Minimum      
Debt Instrument [Line Items]      
Variable interest rate 1.00%    
Eurodollar | 2023 Revolving Credit Facility Due June 2023 | Minimum      
Debt Instrument [Line Items]      
Variable interest rate 0.00%    
Eurodollar | 2023 Revolving Credit Facility Due June 2023 | Minimum | Revolving credit facility      
Debt Instrument [Line Items]      
Variable interest rate 2.50%    
Eurodollar | 2023 Revolving Credit Facility Due June 2023 | Maximum | Revolving credit facility      
Debt Instrument [Line Items]      
Variable interest rate 3.00%    
Eurodollar | Term Loan B Facility Due June 2025      
Debt Instrument [Line Items]      
Variable interest rate 3.00%    
Eurodollar | Term Loan B Facility Due November 2025      
Debt Instrument [Line Items]      
Variable interest rate 2.75%    
Canada Bankers Acceptance Rate | 2023 Revolving Credit Facility Due June 2023      
Debt Instrument [Line Items]      
Variable interest rate 1.00%    
Canada Bankers Acceptance Rate | 2023 Revolving Credit Facility Due June 2023 | Minimum      
Debt Instrument [Line Items]      
Variable interest rate 0.00%    
Base Rate or Prime Rate | 2023 Revolving Credit Facility Due June 2023 | Minimum | Revolving credit facility      
Debt Instrument [Line Items]      
Variable interest rate 1.50%    
Base Rate or Prime Rate | 2023 Revolving Credit Facility Due June 2023 | Maximum | Revolving credit facility      
Debt Instrument [Line Items]      
Variable interest rate 2.00%    
Base Rate or Prime Rate | Term Loan B Facility Due June 2025      
Debt Instrument [Line Items]      
Variable interest rate 2.00%    
Base Rate or Prime Rate | Term Loan B Facility Due November 2025      
Debt Instrument [Line Items]      
Variable interest rate 1.75%