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Coal Trading (Tables) - Coal Trading [Member]
 12 Months Ended
Dec. 31, 2017
Coal Trading [Line Items]  
Trading revenue by type of instrument
Trading revenues recognized during the periods presented below were as follows:
 
 
Successor
Predecessor
Trading Revenues by Type of Instrument
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
Year Ended December 31, 2016
 
Year Ended December 31, 2015
 
 
(Dollars in millions)
Futures, swaps and options
 
$
(37.7
)
$
(10.2
)
 
$
(66.5
)
 
$
107.3

Physical purchase/sale contracts
 
71.3

25.2

 
95.4

 
(66.7
)
Total trading revenues
 
$
33.6

$
15.0

 
$
28.9

 
$
40.6
Schedule of Derivative Instruments [Table Text Block]
The fair value of assets and liabilities from coal trading activities presented on a gross and net basis as of December 31, 2017 and 2016 is set forth below:
Affected line item in the consolidated balance sheets
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Variation margin posted (1)
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets
 
 
(Dollars in millions)
 
 
Successor
 
 
Fair Value as of December 31, 2017
Assets from coal trading activities, net
 
$
77.1

 
$
(74.5
)
 
$
—

 
$
2.6

Liabilities from coal trading activities, net
 
(122.0
)
 
74.5

 
35.8

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

 
$
35.8

 
$
(9.1
)
 
 
 
 
 
 
 
 
 
 
 
Predecessor
 
 
Fair Value as of December 31, 2016
Assets from coal trading activities, net
 
$
191.2

 
$
(190.5
)
 
$
—

 
$
0.7

Liabilities from coal trading activities, net
 
(249.1
)
 
190.5

 
57.4

 
(1.2
)
Total, net
 
$
(57.9
)
 
$
—

 
$
57.4

 
$
(0.5
)
(1) 
None of the net variation margin posted at December 31, 2017 and 2016, respectively, related to cash flow hedges.
Fair value coal trading net assets (liabilities) measured on recurring basis
The following tables set forth the hierarchy of the Company’s net financial asset (liability) coal trading positions for which fair value is measured on a recurring basis as of December 31, 2017 and 2016:
 
Successor
 
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
)
 
Predecessor
 
December 31, 2016
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions) 
Futures, swaps and options
$
—

 
$
(0.1
)
 
$
—

 
$
(0.1
)
Physical purchase/sale contracts
—

 
0.7

 
(1.1
)
 
(0.4
)
Total net financial assets (liabilities)
$
—

 
$
0.6

 
$
(1.1
)
 
$
(0.5
)
Change in the Company's recurring Level 3 net financial assets
The following table summarizes the changes in the Company’s recurring Level 3 net financial liabilities:
 
Successor
Predecessor
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
Year Ended December 31, 2016
 
Year Ended December 31, 2015
 
(Dollars in millions)
Beginning of period
$
(0.7
)
$
(1.1
)
 
$
(15.6
)
 
$
2.1

Transfers into Level 3
—

—

 
5.3

 
(4.4
)
Transfers out of Level 3
0.7

0.2

 
(0.4
)
 
—

Total gains realized/unrealized:
 
 
 
 
 
 
Included in earnings
—

0.2

 
(2.4
)
 
(10.1
)
Purchases
—

—

 
—

 
(0.5
)
Sales
—

—

 
—

 
(0.1
)
Settlements
—

—

 
12.0

 
(2.6
)
End of period
$
—

$
(0.7
)
 
$
(1.1
)
 
$
(15.6
)
Changes in unrealized gains (losses) relating to Level 3 net financial assets
The following table summarizes the changes in net unrealized gains (losses) relating to Level 3 net financial liabilities held both as of the beginning and the end of the period:
 
Successor
Predecessor
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
Year Ended December 31, 2016
 
Year Ended December 31, 2015
 
(Dollars in millions)
Changes in unrealized gains (losses) (1)
$
—

$
0.3

 
$
—

 
$
(6.2
)
(1) 
Within the consolidated statements of operations and 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.