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Intangible Contract Assets and Liabilities Textuals (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2017
Coal supply agreements |  |  |  |  |  |  |
Coal Supply Agreements |  |  |  |  |  |  |
Amortization of Intangible Assets | $ 121.3 |  |  |  |  |  |
Fresh Start Reporting [Member] | Coal supply agreements |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  | $ 314.9
Liabilities |  |  |  |  |  |  | 58.7
Intangible Liabilities |  |  |  |  |  |  | $ 116.2
Successor |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Liabilities | 4,525.4 |  |  |  |  |  |
Successor | Take Or Pay Contracts |  |  |  |  |  |  |
Take-or-Pay Contracts |  |  |  |  |  |  |
Amortization Of Intangible Liabilities | $ 22.5 |  |  |  |  |  |
Scenario, Forecast | Take Or Pay Contracts |  |  |  |  |  |  |
Take-or-Pay Contracts |  |  |  |  |  |  |
Finite-Lived Intangible Liabilities, Amortization Expense, Next Twelve Months |  |  |  |  |  | $ 30.0 |
Finite-Lived Intangible Liabilities, Amortization Expense, Year Two |  |  |  |  | $ 20.0 |  |
Finite-Lived Intangible Liabilities, Amortization Expense, Year Three |  |  |  | $ 10.0 |  |  |
Finite-Lived Intangible Liabilities, Amortization Expense, Year Four |  |  | $ 5.0 |  |  |  |
Finite-Lived Intangible Liabilities, Amortization Expense, Year Five |  | $ 5.0 |  |  |  |  |
Scenario, Forecast | Coal supply agreements |  |  |  |  |  |  |
Coal Supply Agreements |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  |  |  |  |  | 100.0 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  |  |  |  |  | $ 25.0 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  |  |  |  | $ 7.0 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  |  |  | $ 1.0 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | $ 1.0 |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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