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Coal Trading (Tables)
 9 Months Ended
Sep. 30, 2017
Coal Trading [Abstract]  
Trading revenues by type of instrument
Trading revenues (losses) recognized during the periods presented below were as follows:
 
 
Successor
Predecessor
 
Successor
Predecessor
Trading Revenues (Losses) by Type of Instrument
 
Three Months Ended September 30, 2017
Three Months Ended September 30, 2016
 
April 2 through September 30, 2017
January 1 through April 1, 2017
Nine Months Ended September 30, 2016
 
 
(Dollars in millions)
Futures, swaps and options
 
$
(17.1
)
$
(19.6
)
 
$
(24.4
)
$
(10.2
)
$
(42.7
)
Physical purchase/sale contracts
 
36.5

22.3

 
49.0

25.2

59.2

Total trading revenues
 
$
19.4

$
2.7

 
$
24.6

$
15.0

$
16.5
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, 2017 and December 31, 2016 is set forth below:
Affected Line Item in the Condensed Consolidated Balance Sheets
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Condensed Consolidated Balance Sheets
 
Variation Margin Posted (1)
 
Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheets
 
 
(Dollars in millions)
 
 
Successor
 
 
Fair Value as of September 30, 2017
Assets from coal trading activities, net
 
$
127.1

 
$
(124.6
)
 
$
—

 
$
2.5

Liabilities from coal trading activities, net
 
(157.5
)
 
124.6

 
31.9

 
(1.0
)
Total, net
 
$
(30.4
)
 
$
—

 
$
31.9

 
$
1.5

 
 
 
 
 
 
 
 
 
 
 
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 September 30, 2017 and December 31, 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 September 30, 2017 and December 31, 2016:
 
Successor
 
September 30, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(Dollars in millions)
Futures, swaps and options
$
—

 
$
0.5

 
$
—

 
$
0.5

Physical purchase/sale contracts
—

 
1.0

 
—

 
1.0

Total net financial assets
$
—

 
$
1.5

 
$
—

 
$
1.5

 
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
)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following table summarizes the changes in the Company’s recurring Level 3 net financial liabilities:
 
Predecessor
 
Successor
Predecessor
 
Three Months Ended September 30, 2016
 
April 2 through September 30, 2017
January 1 through April 1, 2017
 
Nine Months Ended September 30, 2016
 
(Dollars in millions)
Beginning of period
$
(1.1
)
 
$
(0.7
)
$
(1.1
)
 
$
(15.6
)
Transfers into Level 3
4.6

 
—

—

 
5.0

Transfers out of Level 3
(11.1
)
 
0.7

0.2

 
(0.4
)
Total gains realized/unrealized:
 
 
 
 
 
 
Included in earnings
2.6

 
—

0.2

 
1.2

Sales
0.1

 
—

—

 
—

Settlements
4.2

 
—

—

 
9.1

End of period
$
(0.7
)
 
$
—

$
(0.7
)
 
$
(0.7
)
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings
The following table summarizes the changes in net unrealized gains (losses) relating to Level 3 net financial assets held both as of the beginning and the end of the period:
 
Predecessor
 
Successor
Predecessor
 
Three Months Ended September 30, 2016
 
April 2 through September 30, 2017
January 1 through April 1, 2017
 
Nine Months Ended September 30, 2016
 
(Dollars in millions)
Changes in unrealized gains (losses) (1)
$
0.1

 
$
—

$
0.3

 
$
(0.1
)
(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.
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Schedule Of Future Realization Of Trading Portfolio [Table Text Block]
As of September 30, 2017, the timing of the estimated future realization of the value of the Company’s trading portfolio was as follows:
 
 
Percentage of
Year of Expiration
 
Portfolio Total
2017
 
15
%
2018
 
82
%
2019
 
3
%
 
 
100
%