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Intangible Contract Assets and Liabilities - Textuals (Details) - Fresh Start Reporting - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 03, 2017
Sales Contracts
Fresh-Start Adjustment [Line Items]
Intangible assets											$ 314.9
Liabilities											58.7
Intangible liabilities											$ 116.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible assets and liabilities	$ 24.0	$ 41.5	$ 71.2	$ 78.4
Take-or-pay contracts
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Liabilities	$ 5.4	$ 6.5	$ 16.4	$ 21.5
Scenario, Forecast | Sales Contracts
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization, remainder of 2018										$ 19.0
Amortization, 2019									$ 26.0
Amortization, 2020								$ 8.0
Amortization, 2021							$ 3.0
Amortization, 2022						$ 1.0
Scenario, Forecast | Take-or-pay contracts
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible liabilities, remainder of 2018										$ 5.0
Amortization of intangible liabilities, 2019									$ 17.0
Amortization of intangible liabilities, 2020								$ 9.0
Amortization of intangible liabilities, 2021							$ 4.0
Amortization of intangible liabilities, 2022						$ 3.0
Finite-Lived Intangible Liabilities, Amortization Expense, Beyond Five Years					$ 26.0

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Intangible Liabilities, Gross

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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