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Debt - Components of Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 29, 2020 | Dec. 31, 2019 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Finance leases | $ 2.7 | $ 5.5 |  |  |
Other debt | 48.6 | 63.9 |  |  |
Total | 529.4 | 629.9 |  |  |
Less – current maturities | 18.2 | 102.8 |  |  |
Total long-term debt | $ 511.2 | 527.1 |  |  |
Senior Notes | 6.875% senior secured notes due November 1, 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percentage) | 6.875% |  |  |  |
Face amount | $ 485.0 | 485.0 | $ 485.0 |  |
Unamortized discount and fees | 6.9 | 8.1 |  |  |
Long-term debt, gross | 478.1 | $ 476.9 |  |  |
Senior Notes | 5.50% convertible senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percentage) |  | 5.50% |  |  |
Face amount |  |  |  |  | $ 213.5
Unamortized discount and fees |  | $ 0.6 |  |  |
Long-term debt, gross | $ 0.0 | $ 83.6 |  | $ 84.2 |

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