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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 ($)
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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Finite Lived Intangible Liabilities

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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

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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