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Coal Trading (Tables)
 9 Months Ended
Sep. 30, 2018
Coal Trading [Abstract]  
Trading revenues by type of instrument
Trading revenues (losses) recognized during the periods presented below were as follows:
 
 
Successor
 
Successor
Predecessor
Trading Revenues (Losses) by Type of Instrument
 
Three Months Ended September 30, 2018
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2018
 
April 2 through September 30, 2017
January 1 through April 1, 2017
 
 
(Dollars in millions)
Futures, swaps and options
 
$
(12.1
)
 
$
(17.1
)
 
$
(44.3
)
 
$
(24.4
)
$
(10.2
)
Physical purchase/sale contracts
 
34.7

 
36.5

 
97.0

 
49.0

25.2

Total trading revenues
 
$
22.6

 
$
19.4

 
$
52.7

 
$
24.6

$
15.0
Fair value of assets and liabilities from coal trading activities and related balance sheet offsetting disclosures
The fair value of assets and liabilities from coal trading activities presented on a gross and net basis as of September 30, 2018 and December 31, 2017 is set forth below:
Affected Line Item in the Condensed Consolidated Balance Sheets
 
Gross Amounts of Recognized Assets (Liabilities) (1)
 
Gross Amounts Offset in the Condensed Consolidated Balance Sheets
 
Variation Margin Posted
 
Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets
 
 
(Dollars in millions)
 
 
Fair Value as of September 30, 2018
Other current assets
 
$
81.8

 
$
(81.5
)
 
$
—

 
$
0.3

Accounts payable and accrued expenses
 
(160.4
)
 
81.5

 
69.3

 
(9.6
)
Total, net
 
$
(78.6
)
 
$
—

 
$
69.3

 
$
(9.3
)
 
 
 
 
 
 
 
 
 
 
 
Fair Value as of December 31, 2017
Other current assets
 
$
77.1

 
$
(74.5
)
 
$
—

 
$
2.6

Accounts payable and accrued expenses
 
(122.0
)
 
74.5

 
35.8

 
(11.7
)
Total, net
 
$
(44.9
)
 
$
—

 
$
35.8

 
$
(9.1
)
(1) 
Amounts include net liabilities of $75.2 million and $38.9 million at September 30, 2018 and December 31, 2017, respectively, representing the fair value of financial contracts used to hedge future coal sales, as further described in Note 3. “Revenue Recognition.”
Fair value coal trading net assets (liabilities) measured on recurring basis
The following tables set forth the hierarchy of the Company’s net financial liability coal trading positions for which fair value is measured on a recurring basis as of September 30, 2018 and December 31, 2017:
 
September 30, 2018
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
—

 
$
(2.1
)
 
$
—

 
$
(2.1
)
Physical purchase/sale contracts
—

 
(5.5
)
 
(1.7
)
 
(7.2
)
Total net financial liabilities
$
—

 
$
(7.6
)
 
$
(1.7
)
 
$
(9.3
)
 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
(3.0
)
 
$
(4.2
)
 
$
—

 
$
(7.2
)
Physical purchase/sale contracts
—

 
(1.9
)
 
—

 
(1.9
)
Total net financial liabilities
$
(3.0
)
 
$
(6.1
)
 
$
—

 
$
(9.1
)
Schedule of Quantitative Unobservable Inputs, Level 3 [Table Text Block]
The following table summarizes the quantitative unobservable inputs utilized in the Company's internally-developed valuation models for physical purchase/sale contracts classified as Level 3 as of September 30, 2018:
 
 
Range
 
Weighted
Input
 
Low
 
High
 
Average
Quality
 
(35.6
)%
 
(36.0
)%
 
(35.8
)%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table summarizes the changes in the Company’s recurring Level 3 net financial assets:
 
 
Successor
 
Successor
Predecessor
 
 
Three Months Ended September 30, 2018
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2018
 
April 2 through September 30, 2017
January 1 through April 1, 2017
 
 
(Dollars in millions)
Beginning of period
 
$
—

 
$
—

 
$
—

 
$
(0.7
)
$
(1.1
)
Transfers out of Level 3
 
—

 
—

 
—

 
0.7

0.2

Total (losses) gains realized/unrealized included in earnings
 
(1.7
)
 
—

 
(1.7
)
 
—

0.2

End of period
 
$
(1.7
)
 
$
—

 
$
(1.7
)
 
$
—

$
(0.7
)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]
The following table summarizes the changes in net unrealized (losses) gains relating to Level 3 net financial assets held both as of the beginning and the end of the period:
 
 
Successor
 
Successor
Predecessor
 
 
Three Months Ended September 30, 2018
 
Three Months Ended September 30, 2017
 
Nine Months Ended September 30, 2018
 
April 2 through September 30, 2017
January 1 through April 1, 2017
 
 
(Dollars in millions)
Changes in unrealized (losses) gains (1)
 
$
(1.7
)
 
$
—

 
$
(1.7
)
 
$
—

$
0.3

(1) 
Within the unaudited condensed consolidated statements of operations and unaudited condensed consolidated statements of comprehensive income for the periods presented, unrealized gains and losses from Level 3 items are combined with unrealized gains and losses on positions classified in Level 1 or 2, as well as other positions that have been realized during the applicable periods.