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Reorganization Items, Net Impact of Fresh Start Start Adjustments on Balance Sheet (Details) $ in Millions | Apr. 01, 2017 USD ($)
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Reorganizations [Abstract] |
Inventories | $ 70.1
Other current assets | (333.0)
Property, plant, equipment and mine development, net | (3,461.4)
Investments and other assets | 238.0
Accounts payable and accrued expenses | (14.8)
Deferred income taxes | 177.8
Asset retirement obligations | 73.9
Accrued postretirement benefit costs | 6.9
Other noncurrent liabilities | (120.6)
Total fresh start adjustments, net | $ (3,363.1)

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