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Debt - Estimated Fair Values of Long-term Debt (Details) - Senior Notes - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
6.875% senior secured notes due November 1, 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as a percentage) | 6.875% |
5.50% convertible senior notes due March 1, 2021 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as a percentage) |  | 5.50%
Estimated Fair Value | 6.875% senior secured notes due November 1, 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 527.0 | $ 532.3
Estimated Fair Value | 5.50% convertible senior notes due March 1, 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0.0 | $ 169.8

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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