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Effect of Reorganization Plan and Fresh Start Adjustments on Balance Sheet (Details) $ in Millions | Apr. 01, 2017 USD ($)
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Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract] |
Fresh-start adjustment, increase (decrease), restricted cash | $ (1,000.0)
Fresh-start adjustment, increase (decrease), inventories | 70.1
Fresh-start adjustment, increase (decrease), other current assets | (333.0)
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net | (3,461.4)
Fresh-start adjustment, increase (decrease), Investments | 238.0
Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract] |
Fresh-start adjustment, increase (decrease), accounts payable and accrued expenses | (14.8)
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt | 950.0
Fresh-start adjustment, increase (decrease), deferred income taxes | 177.8
Fresh-start adjustment, increase (decrease), asset retirement obligations | 73.9
Fresh-start adjustment, increase (decrease), accrued postretirement benefit costs | 6.9
Fresh-start adjustment, increase (decrease), other noncurrent liabilities | (120.6)
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract] |
Successor Common Stock | 0.7
Fresh-Start Adjustment, Increase (Decrease), Preferred Stock | 1,305.4
Successor Additional paid-in capital | (1,774.9)
Effect of Plan |
Postconfirmation, Current Assets [Abstract] |
Postconfirmation, total stockholders' equity | $ 3,105.0

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- Definition Amount of fresh-start adjustment to additional paid-in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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- Definition Amount of fresh-start adjustment to common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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- Definition Amount of fresh-start adjustment to inventories. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 + Details
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- Definition Total fresh-start adjustment to property and equipment, net. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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