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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended
Feb. 21, 2019
Aug. 15, 2018
Apr. 28, 2017
Dec. 18, 2013
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Debt Instrument [Line Items]              
Debt repayments         $ 2,600,000 $ 2,600,000  
Debt voluntary repayment           10,000,000.0  
Debt borrowings during the period           10,000,000.0  
Level 2 Inputs              
Debt Instrument [Line Items]              
Long-term debt, fair value         1,143,500,000   $ 1,143,500,000
Receivables Financing Agreement | Wholly-owned Subsidiary              
Debt Instrument [Line Items]              
Credit agreement, maximum borrowing capacity $ 200,000,000.0   $ 175,000,000.0        
Debt instrument, maturity date Feb. 20, 2022   Apr. 27, 2020        
Debt voluntary repayment           10,000,000.0  
Debt borrowings during the period           10,000,000.0  
Credit Agreement | First Lien Credit Facility Term Loans              
Debt Instrument [Line Items]              
Credit agreement date       Dec. 18, 2013      
Debt instrument, term       7 years      
Credit agreement, maximum borrowing capacity       $ 1,460,000,000.0      
Credit Agreement | First Lien Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, term       5 years      
Credit agreement, maximum borrowing capacity       $ 210,000,000.0      
Amended Credit Agreement              
Debt Instrument [Line Items]              
Credit agreement date   Aug. 15, 2018          
Amended Credit Agreement | First Lien Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, term   5 years          
Credit agreement, maximum borrowing capacity   $ 260,000,000.0          
Amended Credit Agreement | Series B Term Loan              
Debt Instrument [Line Items]              
Debt instrument, term   7 years          
Credit agreement, maximum borrowing capacity   $ 1,037,000,000.0          
Debt instrument, original discount   $ 2,800,000          
Debt instrument, basis spread on variable rate   2.50%          
Debt repayments         2,600,000    
Previous Revolving Credit Facility | First Lien Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit agreement, maximum borrowing capacity         210,000,000.0    
Line of credit facility, amount outstanding balance         0   $ 0
Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt repayments           0  
Debt borrowings during the period           $ 0  
Revolving Credit Facility | First Lien Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit agreement, maximum borrowing capacity   $ 260,000,000.0          
Debt repayments         0    
Debt instrument, maturity date   Aug. 15, 2023          
Debt borrowings during the period         $ 0    
Revolving Credit Facility | First Lien Revolving Credit Facility | LIBOR | Minimum              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate   2.00%          
Revolving Credit Facility | First Lien Revolving Credit Facility | LIBOR | Maximum              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate   2.50%