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Intangible Contract Assets and Liabilities Intangible Contract Assets and Liabilities Disclosure (Details) - Successor - Fresh Start Reporting [Member] $ in Millions | Dec. 31, 2017 USD ($)
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Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Assets, Gross | $ 177.2
Finite Lived Intangible Liabilities | (148.8)
Finite-Lived Intangible Assets, Net | 28.4
Coal supply agreements |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Liabilities | (42.7)
Take Or Pay Contracts |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Liabilities | (106.1)
Coal supply agreements |
Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Assets, Gross | 177.2
Finite-Lived Intangible Assets, Net | 134.5
Take Or Pay Contracts |
Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Assets, Gross | 0.0
Investments And Other Assets [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Assets, Gross | 177.2
Finite Lived Intangible Liabilities | 0.0
Finite-Lived Intangible Assets, Net | 177.2
Accounts Payable and Accrued Liabilities [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Assets, Gross | 0.0
Finite Lived Intangible Liabilities | (42.0)
Other Noncurrent Liabilities [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Assets, Gross | 0.0
Finite Lived Intangible Liabilities | $ (106.8)

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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/presentationRef -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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