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Intangible Contract Assets and Liabilities - Intangible Contract Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Liabilities | $ (4.4) | $ (8.4)
Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Assets | 7.9 | 20.7
Liabilities | (52.0) | (61.4)
Net Total | (44.1) | (40.7)
Fresh Start Reporting | Coal supply agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Liabilities | (17.3) | (21.4)
Fresh Start Reporting | Take-or-pay contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Liabilities | (34.7) | (40.0)
Net Total | (34.7) | (40.0)
Investments and other assets | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Assets | 7.9 | 20.7
Liabilities | 0.0 | 0.0
Net Total | 7.9 | 20.7
Accounts payable and accrued expenses | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | (4.4) | (8.4)
Net Total | (4.4) | (8.4)
Other noncurrent liabilities | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | (47.6) | (53.0)
Net Total | (47.6) | (53.0)
Coal supply agreements | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Assets | 7.9 | 20.7
Net Total | (9.4) | (0.7)
Take-or-pay contracts | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Assets | $ 0.0 | $ 0.0

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- Definition Intangible Contract Assets (Liabilities), Net + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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