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Intangible Contract Assets and Liabilities - Balances and Balance Sheet Classifications (Details) - Successor - Fresh Start Reporting - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fresh-Start Adjustment [Line Items]
Assets	$ 143.8	$ 177.2
Liabilities	119.7	133.4
Net Total	24.1	43.8
Take-or-pay contracts
Fresh-Start Adjustment [Line Items]
Assets	0.0	0.0
Coal supply agreements
Fresh-Start Adjustment [Line Items]
Assets	143.8	177.2
Net Total	105.2	134.5
Take-or-pay contracts
Fresh-Start Adjustment [Line Items]
Liabilities	81.1	90.7
Coal supply agreements
Fresh-Start Adjustment [Line Items]
Liabilities	(38.6)	(42.7)
Investments and other assets
Fresh-Start Adjustment [Line Items]
Assets	143.8	177.2
Liabilities	0.0	0.0
Net Total	143.8	177.2
Accounts payable and accrued expenses
Fresh-Start Adjustment [Line Items]
Assets	0.0	0.0
Liabilities	25.1	27.6
Other noncurrent liabilities
Fresh-Start Adjustment [Line Items]
Assets	0.0	0.0
Liabilities	$ 94.6	$ 105.8

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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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