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Long-Term Debt - Narrative - Senior Credit Facility (Details) - USD ($)
Sep. 20, 2018
Dec. 31, 2020
Sep. 19, 2018
Minimum      
Debt Instrument [Line Items]      
Commitment fees (basis points) 0.30%    
Maximum      
Debt Instrument [Line Items]      
Commitment fees (basis points) 0.45%    
Term loan | Minimum      
Debt Instrument [Line Items]      
Letter of credit fees (basis points) 1.75%    
Term loan | Maximum      
Debt Instrument [Line Items]      
Letter of credit fees (basis points) 2.50%    
Term loan | London Interbank Offered Rate (LIBOR) | Minimum      
Debt Instrument [Line Items]      
Applicable margin (basis points) 1.75%    
Term loan | London Interbank Offered Rate (LIBOR) | Maximum      
Debt Instrument [Line Items]      
Applicable margin (basis points) 2.50%    
Secured Debt | Senior Credit Facility, Due 2023      
Debt Instrument [Line Items]      
Line of credit, borrowing capacity $ 1,000,000,000.0    
Increase in maximum leverage ratio 0.50    
Secured Debt | Senior Credit Facility, Due 2023 | Minimum      
Debt Instrument [Line Items]      
Interest coverage ratio 3.00    
Secured Debt | Senior Credit Facility, Due 2023 | Maximum      
Debt Instrument [Line Items]      
Maximum leverage ratio 3.25    
Secured Debt | Senior Credit Facility, Due 2023 | Maximum | From October 1, 2020, through September 30, 2021      
Debt Instrument [Line Items]      
Leverage ratio 3.75    
Secured Debt | Senior Credit Facility, Due 2023 | Maximum | On or after October 1, 2021      
Debt Instrument [Line Items]      
Leverage ratio 3.50    
Secured Debt | Senior Credit Facility, Due 2023 | Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit, borrowing capacity $ 650,000,000.0    
Long-term debt   $ 0  
Secured Debt | Senior Credit Facility, Due 2023 | Term loan      
Debt Instrument [Line Items]      
Line of credit, borrowing capacity $ 350,000,000.0    
Secured Debt | Senior Credit Facility, Due 2023 | Term loan | From December 31, 2020 until December 31, 2022      
Debt Instrument [Line Items]      
Loan amortization rate (percentage) 7.50%    
Secured Debt | Senior Credit Facility, Due 2023 | Term loan | On or after December 31, 2022      
Debt Instrument [Line Items]      
Loan amortization rate (percentage) 10.00%    
Secured Debt | Senior Credit Facility | Term loan      
Debt Instrument [Line Items]      
Line of credit, borrowing capacity     $ 750,000,000.0
Line of Credit | Letter of Credit      
Debt Instrument [Line Items]      
Outstanding letters of credit   $ 27,600,000