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Emergence from the Chapter 11 Cases and Fresh Start Reporting - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions | Apr. 01, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Common stock, shares issued (in shares) |  | 137.3 |  |
Assets held-for-sale |  |  | $ 228,500,000 |
Write off of mine development costs | $ 89,500,000 |  |  |
Write off of prepaid assets | 15,000,000 |  |  |
Successor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, preferred stock | 1,305,400,000 |  |  |
Postconfirmation, total stockholders' equity | 3,131,900,000 |  |  |
Postconfirmation, long-term debt | 1,853,700,000 |  |  |
Debt issuance cost |  | $ 78,400,000 |  |
Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Final equity value | $ 3,081,000,000 |  |  |
Postconfirmation, common stock, share price (in dollars per share) | $ 22.02 |  |  |
Common stock, shares issued (in shares) | 70.9 |  |  |
Common stock, shares outstanding (in shares) | 70.9 |  |  |
Common stock, par value per share (in dollars per share) | $ 0.01 |  |  |
Postconfirmation, preferred stock | $ 750,000,000 |  |  |
Discount percent of common stock value | 35.00% |  |  |
Postconfirmation, Common Stock, Initial Share Price Estimate | $ 25.00 |  |  |
Dividends, common stock, paid in kind, guaranteed period | 3 years |  |  |
Dividends, common stock, paid in kind, annual stated rate | 8.50% |  |  |
Convertible preferred stock, shares issued upon conversion | 46.2 |  |  |
Equity ownership percent | 42.00% |  |  |
Postconfirmation, total stockholders' equity | $ 3,105,000,000 |  |  |
Convertible preferred stock, converted shares, fair value | $ 1,305,400,000 |  |  |
Discount rate | 4.10% |  |  | 4.15%
Remeasurement reduction in pension liabilities | $ 9,200,000 |  |  |
2017 Incentive Plan | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Common stock reserved for future issuance | 14.1 |  |  |
Incentive plan expiration period | 10 years |  |  |
Common stock, shares issued (in shares) |  | 3.6 |  |
Minimum | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Final equity value | $ 4,200,000,000 |  |  |
Discounted cash flow, estimated weighed average cost of capital, percent | 11.00% |  |  |
Maximum | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Final equity value | $ 4,900,000,000 |  |  |
Discounted cash flow, estimated weighed average cost of capital, percent | 14.00% |  |  |
Restricted Stock | 2017 Incentive Plan | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Fair value of stock granted | $ 80,000,000 |  |  |
Paid In Kind | Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Convertible preferred stock, shares issued upon conversion | 13.1 |  |  |
Senior Secured Term Loan | Term Loan | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, long-term debt | $ 950,000,000 |  |  |
Debt issuance cost | 37,300,000 |  |  |
Successor Notes | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Debt issuance cost | 49,500,000 |  |  |
Principal amount | 1,000,000,000.0 |  |  |
Coal supply agreements | Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Finite-lived intangible assets, fair value | $ 314,900,000 |  |  |
Useful life | 3 years |  |  |
Finite-lived intangible assets, fair value, noncurrent | $ 58,700,000 |  |  |
Port And Rail Take Or Pay Contracts | Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Finite-lived intangible assets, fair value | 32,600,000 |  |  |
Liabilities, held-for-sale |  |  | $ 15,700,000 |
Finite-lived intangible assets, fair value, noncurrent | $ 83,600,000 |  |  |
UNITED STATES | Asset Retirement Obligation | Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Risk free interest rate | 9.36% |  |  |
AUSTRALIA | Asset Retirement Obligation | Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Risk free interest rate | 4.36% |  |  |

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