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Long-Term Debt - Summary (Details) - USD ($) $ in Millions | Sep. 30, 2021 | May 03, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Finance lease obligations | $ 279.9 |  | $ 281.2
Less: unamortized debt issuance costs and discounts | (17.2) |  | (16.3)
Total debt | 2,852.7 |  | 2,856.8
Less: Current maturities | 60.8 |  | 64.4
Total long-term debt | 2,791.9 |  | 2,792.4
Secured Debt | Senior secured term loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 1,534.5 |  | 1,539.4
Unamortized fair value discount (premium) | 3.1 |  | 3.7
Senior Notes | 6.750% senior unsecured notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 370.0 |  | 370.0
Stated interest rate (percent) | 6.75% | 6.75% |
Senior Notes | 10.000% senior unsecured notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 545.0 |  | 545.0
Stated interest rate (percent) | 10.00% |  |
Notes payable and other secured loans |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 140.5 |  | $ 137.5

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