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Intangible Contract Assets and Liabilities - Textuals (Details) - Fresh Start Reporting - USD ($) $ in Millions | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 03, 2017
Sales Contracts |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 314.9
Liabilities |  |  |  |  |  |  | 58.7
Intangible liabilities |  |  |  |  |  |  | $ 116.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Amortization of intangible assets and liabilities | $ 29.3 |  |  |  |  |  |
Take-or-pay contracts |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Amortization of Intangible Liabilities | $ 8.3 |  |  |  |  |  |
Scenario, Forecast | Sales Contracts |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Amortization, remainder of 2018 |  |  |  |  |  | $ 68.0 |
Amortization, 2019 |  |  |  |  | $ 27.0 |  |
Amortization, 2020 |  |  |  | $ 8.0 |  |  |
Amortization, 2021 |  |  | $ 3.0 |  |  |  |
Amortization, 2022 |  | $ 1.0 |  |  |  |  |
Scenario, Forecast | Take-or-pay contracts |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Amortization of intangible liabilities, remainder of 2018 |  |  |  |  |  | $ 19.0 |
Amortization of intangible liabilities, 2019 |  |  |  |  | $ 18.0 |  |
Amortization of intangible liabilities, 2020 |  |  |  | $ 9.0 |  |  |
Amortization of intangible liabilities, 2021 |  |  | $ 4.0 |  |  |  |
Amortization of intangible liabilities, 2022 |  | $ 3.0 |  |  |  |  |

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