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Acquisition of Shoal Creek Mine Textuals (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended							9 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2018	Feb. 22, 2019	Dec. 03, 2018
Subsequent Event | Shoal Creek
Business Combination, Separately Recognized Transactions [Line Items]
Current liability - working capital adjustment											$ 2.4
Successor
Business Combination, Separately Recognized Transactions [Line Items]
Contract Based Intangible Liabilities	$ 20.3	$ 20.3				$ 27.6			$ 27.6	$ 20.3
Revenues		1,397.1	$ 1,412.6	$ 1,309.4	$ 1,462.7	1,517.1	$ 1,477.2	$ 1,258.3	4,252.6	5,581.8
Net income		$ 252.6	$ 71.5	$ 113.7	$ 106.6	$ 317.4	$ 201.4	$ (20.2)	$ 498.6	544.4
Successor | Drummond Company, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisition, Purchase Price												$ 387.4
Successor | Shoal Creek
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisition, Purchase Price												387.4
Current liability - working capital adjustment												6.5
Contract Based Intangible Liabilities												$ 3.5
Revenues	12.8
Net income	$ 0.1
Excluded Acquisition Costs										$ 7.4

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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