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Reorganization Items, Net Impact of Fresh Start Start Adjustments on Balance Sheet (Details) $ in Millions	Apr. 01, 2017 USD ($)
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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