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v3.19.3.a.u2

Reorganization Items, Net Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2017 USD ($) years $ / shares shares | Apr. 01, 2017 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net | $ (3,031.2) | $ 3,031.2 | $ 12.8 |  |  |
Property, Plant, and Equipment, Fair Value Disclosure | $ 3,461.4 | $ 3,461.4 |  |  |  |
Asset Retirement Obligation |  |  | $ 750.2 | $ 752.3 | $ 691.1 |
Effect of Reorganization Plan [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common Stock, shares issued (in shares) | shares | 70.9 | 70.9 |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.01 | $ 0.01 |  |  |  |
Postconfirmation, Preferred Stock | $ 750.0 | $ 750.0 |  |  |  |
Preferred Stock, Conversion, Discount Percent Of Common Stock Value | 35.00% | 35.00% |  |  |  |
Postconfirmation, Common Stock, Initial Share Price Estimate | $ / shares | $ 25.00 | $ 25.00 |  |  |  |
Dividends, Common Stock, Paid In Kind, Guaranteed Period | years | 3 |  |  |  |  |
Dividends, Common Stock, Paid In Kind, Annual Stated Rate | 8.50% | 8.50% |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | shares | 46.2 | 46.2 |  |  |  |
Convertible Preferred Stock, Converted Shares, Equity Ownership Percent | 42.00% | 42.00% |  |  |  |
Postconfirmation, Stockholders' Equity | $ 3,105.0 | $ 3,105.0 |  |  |  |
Convertible Preferred Stock, Converted Shares, Fair Value | 1,305.4 | $ 1,305.4 |  |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure |  |  |  |  |  | $ 228.5
Write Off Of Mine Development Costs | 89.5 |  |  |  |  |
Write Off Of Prepaid Assets | 15.0 |  |  |  |  |
Increase (Decrease) in Obligation, Pension Benefits | $ 9.2 |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.10% | 4.10% | 4.15% |  |  |
Paid In Kind | Effect of Reorganization Plan [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | shares | 13.1 | 13.1 |  |  |  |
Land and coal interests |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure | $ 3,504.7 | $ 3,504.7 |  |  |  |
Asset Retirement Obligation | 281.2 | 281.2 |  |  |  |
Buildings and improvements |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Postconfirmation, Property and Equipment, Net | 466.1 | 466.1 |  |  |  |
Machinery and equipment |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Postconfirmation, Property and Equipment, Net | 940.5 | 940.5 |  |  |  |
Coal supply agreements | Effect of Reorganization Plan [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets, Fair Value Disclosure | 314.9 | 314.9 |  |  |  |
Finite-Lived Intangible Assets, Fair Value Disclosure, Noncurrent | 58.7 | 58.7 |  |  |  |
Contract-Based Intangible Assets | Effect of Reorganization Plan [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets, Fair Value Disclosure | 32.6 | 32.6 |  |  |  |
Liabilities, Held For Sale |  |  |  |  |  | $ 15.7
Finite-Lived Intangible Assets, Fair Value Disclosure, Noncurrent | $ 83.6 | $ 83.6 |  |  |  |
Australian Operations |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Credit adjusted risk free interest rates |  |  | 4.36% |  |  |
U.S. Obligations |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Credit adjusted risk free interest rates |  |  | 9.36% |  |  |

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