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Valuation and Qualifying Accounts Schedule II (Tables) | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Summary of Valuation Allowance [Table Text Block] | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
Description |  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions(1) |  | Other |  | Balance at End of Period
|  | (Dollars in millions)
Successor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
April 2 through December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |  |
Advance royalty recoupment reserve |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Reserve for materials and supplies |  | — |  |  | 1.0 |  |  | — |  |  | (0.4 | ) |  | — |  |  | 0.6 |
Allowance for doubtful accounts |  | — |  |  | 4.6 |  |  | — |  |  | — |  |  | — |  |  | 4.6 |
Tax valuation allowances |  | 3,288.4 |  |  | (744.9 | ) |  | — |  |  | — |  |  | (111.0 | ) | (6) | 2,432.5 |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |
January 1 through April 1, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |
Advance royalty recoupment reserve |  | $ | 7.8 |  |  | $ | — |  |  | $ | (7.4 | ) | (5) | $ | (0.4 | ) |  | $ | — |  |  | $ | — |
Reserve for materials and supplies |  | 5.6 |  |  | 0.5 |  |  | (6.1 | ) | (5) | — |  |  | — |  |  | — |
Allowance for doubtful accounts |  | 13.1 |  |  | — |  |  | (12.8 | ) | (5) | (0.3 | ) |  | — |  |  | — |
Tax valuation allowances |  | 4,037.5 |  |  | (777.2 | ) |  | 28.1 |  | (5) | — |  |  | — |  |  | 3,288.4 |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance royalty recoupment reserve |  | $ | 8.3 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | (1.0 | ) | (2) | $ | — |  |  | $ | 7.8 |
Reserve for materials and supplies |  | 4.7 |  |  | 4.3 |  |  | — |  |  | (3.4 | ) |  | — |  |  | 5.6 |
Allowance for doubtful accounts |  | 6.6 |  |  | 7.9 |  |  | — |  |  | (1.4 | ) |  | — |  |  | 13.1 |
Tax valuation allowances |  | 1,614.1 |  |  | 2,453.9 |  |  | — |  |  | — |  |  | (30.5 | ) | (3) | 4,037.5 |
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance royalty recoupment reserve |  | $ | 7.6 |  |  | $ | — |  |  | $ | — |  |  | $ | (0.9 | ) | (2) | $ | 1.6 |  | (4) | $ | 8.3 |
Reserve for materials and supplies |  | 4.6 |  |  | 0.4 |  |  | — |  |  | (0.3 | ) |  | — |  |  | 4.7 |
Allowance for doubtful accounts |  | 5.8 |  |  | 8.0 |  |  | — |  |  | (7.2 | ) |  | — |  |  | 6.6 |
Tax valuation allowances |  | 1,366.5 |  |  | 452.9 |  |  | — |  |  | — |  |  | (205.3 | ) | (3) | 1,614.1 |
(1) | Reserves utilized, unless otherwise indicated.
(2) | Deductions to advance royalty recoupment reserve represents the termination of federal and state leases.
(3) | Includes the impact of the decrease in Australian dollar exchange rates.
(4) | Balances transferred from other accounts.
(5) | Fresh start reporting adjustments.
(6) | Release of valuation allowance primarily related to carrybacks of U.S. net operating losses.

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- References No definition available. + Details
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