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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - Revolving Credit Facility - USD ($)
12 Months Ended
Jun. 14, 2019
Dec. 31, 2020
Dec. 31, 2019
Credit Facilities 2024      
Debt Instrument      
Maximum percentage of capital stock guaranteed by company   65.00%  
Unamortized debt issuance costs   $ 5,000,000.0 $ 5,500,000
Credit Facilities 2024 | LIBOR | Minimum      
Debt Instrument      
Debt instrument variable rate (percent) 1.25%    
Credit Facilities 2024 | LIBOR | Maximum      
Debt Instrument      
Debt instrument variable rate (percent) 2.25%    
Credit Facilities 2024 | Adjusted Base Rate | Minimum      
Debt Instrument      
Debt instrument variable rate (percent) 0.25%    
Credit Facilities 2024 | Adjusted Base Rate | Maximum      
Debt Instrument      
Debt instrument variable rate (percent) 1.25%    
Senior secured revolving credit facility      
Debt Instrument      
Maximum borrowing capacity $ 550,000,000.0    
Payments of debt issuance costs   11,100,000  
Unamortized debt issuance costs   7,800,000 9,500,000
Term long due June 2024      
Debt Instrument      
Maximum borrowing capacity $ 450,000,000.0    
Debt issuance costs   $ 7,000,000.0 6,100,000
Debt issuance cost, amortization term (term)   5 years  
Unamortized debt issuance costs   $ 5,000,000.0 $ 5,500,000