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Debt - Schedule of Long-term Debt Obligations (Details) - USD ($)
Dec. 31, 2020
Sep. 30, 2020
Feb. 13, 2020
Debt Instrument [Line Items]      
Total debt $ 1,000,000,000 $ 1,018,000,000  
Unamortized debt issuance costs for the senior notes (12,143,000) (12,686,000)  
Total debt, net of issuance costs 987,857,000 1,005,314,000  
4.000% Senior Notes Due 2028      
Debt Instrument [Line Items]      
Senior Notes     $ 500,000,000
3.625% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Senior Notes     $ 500,000,000
Long-term Debt [Member] | Line of Credit      
Debt Instrument [Line Items]      
Credit facility revolver 0 18,000,000  
Long-term Debt [Member] | 4.000% Senior Notes Due 2028      
Debt Instrument [Line Items]      
Senior Notes 500,000,000 500,000,000  
Long-term Debt [Member] | 3.625% Senior Notes Due 2025      
Debt Instrument [Line Items]      
Senior Notes $ 500,000,000 $ 500,000,000