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Long-Term Debt - Term Loan and Revolving Credit Facility - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 16, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Apr. 17, 2017
Long-term debt          
Payments under Revolving Credit Facility     $ 357,000,000 $ 245,000,000  
Revolving Credit Facility          
Long-term debt          
Payments under Revolving Credit Facility     357,000,000.0    
Revolving Credit Facility          
Long-term debt          
Credit facility         $ 500,000,000.0
Proceeds from lines of credit $ 465,000,000.0        
Available borrowing capacity   $ 372,900,000 $ 372,900,000    
Commitment fee on unused portion of the credit facility   0.50%      
Interest rates   3.13% 3.13%    
Revolving Credit Facility | Minimum | LIBOR          
Long-term debt          
Spread on variable rate (as a percent)   1.75%      
Revolving Credit Facility | Minimum | Base rate          
Long-term debt          
Spread on variable rate (as a percent)   0.75%      
Revolving Credit Facility | Maximum | LIBOR          
Long-term debt          
Spread on variable rate (as a percent)   2.50%      
Revolving Credit Facility | Maximum | Base rate          
Long-term debt          
Spread on variable rate (as a percent)   1.50%      
Letter of Credit          
Long-term debt          
Amount outstanding   $ 19,100,000 $ 19,100,000    
Term Loan Under Secured Credit Facility          
Long-term debt          
Credit facility         $ 1,500,000,000
Interest rates   3.25% 3.25%    
Term Loan Under Secured Credit Facility | LIBOR          
Long-term debt          
Spread on variable rate (as a percent)   2.25%      
Term Loan Under Secured Credit Facility | Base rate          
Long-term debt          
Spread on variable rate (as a percent)   1.25%