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Derivatives and Fair Value Measurements (Tables) - Non Coal Trading [Member]

12 Months Ended

Dec. 31, 2017

Derivative [Line Items]

Derivative Instruments, Gain (Loss)

The tables below show the classification and amounts of pre-tax gains and losses related to the Company’s Corporate Hedging derivatives during the period April 2 through December 31, 2017, January 1 through April 1, 2017 and the years ended December 31, 2016 and 2015:

				Successor
				April 2 through December 31, 2017
		Income Statement Classification		Total gain recognized in income				Gain realized in income on derivatives				Unrealized loss recognized in income on derivatives
Financial Instrument
				(Dollars in millions)
Foreign currency option contracts		Operating costs and expenses		$	1.8			$	3.3			$	(1.5	)
Total				$	1.8			$	3.3			$	(1.5	)

				Predecessor
				January 1 through April 1, 2017
		Income Statement Classification		Total loss recognized in income				Loss reclassified from other comprehensive loss into income
Financial Instrument
				(Dollars in millions)
Commodity swap contracts		Operating costs and expenses		$	(11.0	)		$	(11.0	)
Foreign currency forward contracts		Operating costs and expenses		(16.6		)		(16.6		)
Total				$	(27.6	)		$	(27.6	)

				Predecessor
				Year Ended December 31, 2016
		Income Statement Classification		Total realized loss recognized in income				Loss reclassified from other comprehensive income into income (effective portion) (1)				(Loss) gain reclassified from other comprehensive income into income (ineffective portion)
Financial Instrument
				(Dollars in millions)
Commodity swap contracts		Operating costs and expenses		$	(98.0	)		$	(86.1	)		$	(11.9	)
Commodity swap contracts		Reorganization items, net		(38.8		)		—				(38.8		)
Foreign currency forward contracts		Operating costs and expenses		(142.9		)		(145.6		)		2.7
Foreign currency forward contracts		Reorganization items, net		(36.4		)		—				(36.4		)
Total				$	(316.1	)		$	(231.7	)		$	(84.4	)

⁽¹⁾  Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $13.6 million and $9.0 million of previously unrecognized losses on foreign currency and fuel contracts, respectively, monetized in the first quarter of 2016.

				Predecessor
				Year Ended December 31, 2015
		Income Statement Classification		Loss recognized in other comprehensive income on derivative (effective portion)				Loss reclassified from other comprehensive income into income (effective portion) (1)				Gain reclassified from other comprehensive income into income (ineffective portion)
Financial Instrument
				(Dollars in millions)
Commodity swap contracts		Operating costs and expenses		$	(77.0	)		$	(122.0	)		$	1.6
Foreign currency forward contracts		Operating costs and expenses		(122.0		)		(316.4		)		—
Total				$	(199.0	)		$	(438.4	)		$	1.6

⁽¹⁾  Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $14.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables set forth the hierarchy of the Company’s net financial asset positions for which fair value is measured on a recurring basis:

	Successor
	December 31, 2017
	Level 1				Level 2				Level 3				Total
	(Dollars in millions)
Foreign currency option contracts	$	—			$	4.2			$	—			$	4.2
Total net financial assets	$	—			$	4.2			$	—			$	4.2

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table summarizes the changes related to the Company’s Corporate Hedging derivative financial instruments recurring Level 3 financial liabilities:

		Predecessor
		December 31, 2016
		Commodity Contracts				Foreign Currency Contracts				Total
	(Dollars in millions)
Beginning of period		$	123.7			$	200.7			$	324.4
Total net losses realized/unrealized:
Included in earnings		15.7				(48.0		)		(32.3		)
Settlements / terminations		(139.4		)		(152.7		)		(292.1		)
End of period		$	—			$	—			$	—

Carrying Amounts And Estimated Fair Values Of Companys Debt [Table Text Block]

The carrying amount and estimated fair value of the Company’s current and long-term debt as of December 31, 2017 are summarized as follows:

	Successor
	December 31, 2017
	Carrying Amount				Estimated Fair Value
	(Dollars in millions)
Current and Long-term debt	$	1,460.8			$	1,547.4

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258

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-SubTopic 10
-Section 50
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