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Debt and Credit Facilities - Senior Notes and Amended and Restated Senior Secured Credit Facilities (Details) - USD ($) | Nov. 26, 2019 | Sep. 30, 2020 | Aug. 01, 2019
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Debt Instrument [Line Items] |  |  |
Gain on settlement of interest rate swaps | $ (600,000) |  |
Senior Notes due December 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument face amount | $ 425,000,000 |  |
Debt interest rate | 4.00% | 4.00% |
Debt issuance costs capitalized | $ 3,500,000 |  |
6.50% Senior Notes due December 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Debt interest rate | 6.50% |  |
Repurchased face amount | $ 425,000,000 |  |
Aggregate repurchase amount | 452,000,000.0 |  |
Premium on redemption of debt | 15,500,000 |  |
Accrued interest recognized | 11,500,000 |  |
Loss on debt extinguishment | 16,100,000 |  |
Accelerated amortization of original issuance discount | $ 1,200,000 |  |
Third Amended and Restated Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Lender and third-party fees |  |  | $ 400,000
Third Amended and Restated Credit Agreement | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facilities |  |  | $ 475,000,000

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