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Debt and Financing Obligations (Schedule of Debt) (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Total borrowings | $ 543,800,000 | $ 627,000,000.0
Debt issuance costs | (11,600,000) | (13,400,000)
Total debt and financing obligation | 532,200,000 | 613,600,000
Less: current portion of long-term debt and financing obligation | 3,300,000 | 3,200,000
Total long-term debt and financing obligation | $ 528,900,000 | 610,400,000
Senior Notes, Due 2029 | Senior notes |  |
Debt Instrument [Line Items] |  |
Interest rate on senior notes (as a percent) | 4.875% |
Total borrowings | $ 500,000,000.0 | 500,000,000.0
$350.0 revolving credit facility, due 2026 ("Revolving Facility") | Line of Credit | Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Principal amount of term loan | 350,000,000.0 |
Total borrowings | $ 35,000,000.0 | 115,000,000.0
5.346 percent financing obligation, due 2024 | Financing Obligation |  |
Debt Instrument [Line Items] |  |
Interest rate on senior notes (as a percent) | 5.346% |
Total borrowings | $ 8,800,000 | $ 12,000,000.0

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