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Derivatives and Fair Value Measurements Financial Instruments Measured on a Recurring Basis (Details) - Successor - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 11.8	$ (5.0)
Level 1
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0	(3.0)
Level 2
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	1.8	(2.0)
Level 3
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	10.0	0.0
Foreign currency option contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	1.2	4.2
Foreign currency option contracts | Level 1
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0	0.0
Foreign currency option contracts | Level 2
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	1.2	4.2
Foreign currency option contracts | Level 3
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0	0.0
Coal contracts related to forecasted sales
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(21.2)	(40.2)
Coal contracts related to forecasted sales | Level 1
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0	0.0
Coal contracts related to forecasted sales | Level 2
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(21.2)	(40.2)
Coal contracts related to forecasted sales | Level 3
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0	0.0
Coal trading contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	21.8	31.0
Coal trading contracts | Level 1
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0	(3.0)
Coal trading contracts | Level 2
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	21.8	34.0
Coal trading contracts | Level 3
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0	$ 0.0
Equity Securities
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	10.0
Equity Securities | Level 1
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0
Equity Securities | Level 2
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0
Equity Securities | Level 3
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 10.0

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

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+ References

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