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Acquisition of Shoal Creek Mine - Purchase Accounting (Details) - Shoal Creek - USD ($) $ in Millions	7 Months Ended
	Jun. 30, 2019	Dec. 03, 2018
Allocations
Inventories	$ 40.1	$ 39.7
Property, plant, equipment and mine development	368.1	364.7
Current liabilities	(4.1)	(4.1)
Asset retirement obligations	(14.3)	(10.5)
Total purchase price	389.8	$ 389.8
Adjustments
Inventories	0.4
Property, plant, equipment and mine development	3.4
Current liabilities	0.0
Asset retirement obligations	(3.8)
Total purchase price	$ 0.0

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