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Intangible Contract Assets and Liabilities Intangible Contract Assets and Liabilities Disclosure (Details) - Successor - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Liabilities | $ (20.3) | $ (27.6)
Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 70.9 | 177.2
Finite Lived Intangible Liabilities | (90.0) | (133.4)
Finite-Lived Liabilities, Net | (19.1) |
Finite-Lived Intangible Assets, Net |  | 43.8
Fresh Start Reporting | Coal supply agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Liabilities | (32.9) | (42.7)
Fresh Start Reporting | Take-or-pay contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Liabilities | (57.1) | (90.7)
Finite-Lived Liabilities, Net | (57.1) | (90.7)
Investments and other assets | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 70.9 | 177.2
Finite Lived Intangible Liabilities | 0.0 | 0.0
Finite-Lived Intangible Assets, Net | 70.9 | 177.2
Accounts payable and accrued expenses | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 0.0 | 0.0
Finite Lived Intangible Liabilities | (20.3) | (27.6)
Finite-Lived Liabilities, Net | (20.3) | (27.6)
Other noncurrent liabilities | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 0.0 | 0.0
Finite Lived Intangible Liabilities | (69.7) | (105.8)
Finite-Lived Liabilities, Net | (69.7) | (105.8)
Coal supply agreements | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 70.9 | 177.2
Finite-Lived Intangible Assets, Net | 38.0 | 134.5
Take-or-pay contracts | Fresh Start Reporting |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 0.0 | $ 0.0

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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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