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Acquisition of Shoal Creek Mine - Textuals (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 31, 2019	Dec. 03, 2018
Business Acquisition [Line Items]
Depreciation, depletion and amortization	$ 141.5				$ 169.6	$ 479.4	$ 503.1
Finite Lived Intangible Liabilities	64.6			$ 90.0		64.6
Revenues	1,106.4				1,412.6	3,506.0	4,184.7
Net (loss) income attributable to common stockholders	(82.8)				$ 71.5	78.5	291.8
Shoal Creek
Business Acquisition [Line Items]
Depreciation, depletion and amortization		$ 0.4	$ 0.5	$ 0.4
Working Capital Adjustment								$ 2.4
Total purchase price	$ 389.8					$ 389.8			$ 389.8
Finite Lived Intangible Liabilities									3.5
Business Acquisition, Pro Forma Taxable Income Impact							$ 0.0
Drummond Company, Inc.
Business Acquisition [Line Items]
Purchase price									$ 387.4

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