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Segment and Geographic Information Segment Results (Details) - USD ($) $ in Millions		3 Months Ended									9 Months Ended	12 Months Ended
	Apr. 01, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Apr. 01, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Successor
Segment Reporting Information [Line Items]
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
Adjusted EBITDA											1,145.3	1,379.3
Additions to property, plant, equipment and mine development											166.6	301.0
Federal coal lease expenditures											0.0	0.5
Income from equity affiliates			$ (17.2)	$ (25.2)	$ (22.0)	$ (22.8)	$ (10.5)	$ (15.7)			(49.0)	(68.1)
Successor | Powder River Basin Mining
Segment Reporting Information [Line Items]
Revenues											1,178.7	1,424.8
Adjusted EBITDA											278.8	284.5
Additions to property, plant, equipment and mine development											32.6	81.0
Federal coal lease expenditures												0.0
Income from equity affiliates											0.0	0.0
Successor | Midwestern U.S. Mining
Segment Reporting Information [Line Items]
Revenues											592.3	801.0
Adjusted EBITDA											124.4	145.2
Additions to property, plant, equipment and mine development											21.7	46.6
Federal coal lease expenditures												0.0
Income from equity affiliates											0.0	0.0
Successor | Western U.S. Mining
Segment Reporting Information [Line Items]
Revenues											440.7	592.0
Adjusted EBITDA											131.8	145.4
Additions to property, plant, equipment and mine development											13.8	13.9
Federal coal lease expenditures												0.5
Income from equity affiliates											0.0	0.0
Successor | Seaborne Metallurgical Mining
Segment Reporting Information [Line Items]
Revenues											1,221.0	1,553.0
Adjusted EBITDA											414.9	441.4
Additions to property, plant, equipment and mine development											56.0	88.7
Federal coal lease expenditures												0.0
Income from equity affiliates											0.0	0.0
Successor | Seaborne Thermal Mining
Segment Reporting Information [Line Items]
Revenues											772.5	1,099.2
Adjusted EBITDA											306.6	452.0
Additions to property, plant, equipment and mine development											39.2	66.6
Federal coal lease expenditures												0.0
Income from equity affiliates											0.0	0.0
Successor | Corporate and Other
Segment Reporting Information [Line Items]
Revenues											47.4	111.8
Adjusted EBITDA											(111.2)	(89.2)
Additions to property, plant, equipment and mine development											3.3	4.2
Federal coal lease expenditures												0.0
Income from equity affiliates											$ (49.0)	$ (68.1)
Predecessor
Segment Reporting Information [Line Items]
Revenues	$ 0.0								$ 1,326.2	$ 1,326.2			$ 4,715.3
Adjusted EBITDA									341.3				532.0
Additions to property, plant, equipment and mine development									32.8				126.6
Federal coal lease expenditures									0.5				249.0
Income from equity affiliates									(15.0)	$ (15.0)			(16.2)
Predecessor | Powder River Basin Mining
Segment Reporting Information [Line Items]
Revenues									394.3				1,473.3
Adjusted EBITDA									91.7				379.9
Additions to property, plant, equipment and mine development									19.3				33.0
Federal coal lease expenditures									0.0				248.4
Income from equity affiliates									0.0				0.0
Predecessor | Midwestern U.S. Mining
Segment Reporting Information [Line Items]
Revenues									193.2				792.5
Adjusted EBITDA									50.0				217.3
Additions to property, plant, equipment and mine development									2.8				18.7
Federal coal lease expenditures									0.0				0.0
Income from equity affiliates									0.0				0.0
Predecessor | Western U.S. Mining
Segment Reporting Information [Line Items]
Revenues									149.7				526.0
Adjusted EBITDA									50.0				101.6
Additions to property, plant, equipment and mine development									3.1				20.8
Federal coal lease expenditures									0.5				0.6
Income from equity affiliates									0.0				0.0
Predecessor | Seaborne Metallurgical Mining
Segment Reporting Information [Line Items]
Revenues									328.9				1,090.4
Adjusted EBITDA									109.6				(16.3)
Additions to property, plant, equipment and mine development									5.2				29.9
Federal coal lease expenditures									0.0				0.0
Income from equity affiliates									0.0				0.0
Predecessor | Seaborne Thermal Mining
Segment Reporting Information [Line Items]
Revenues									224.8				824.9
Adjusted EBITDA									75.6				217.6
Additions to property, plant, equipment and mine development									2.3				22.1
Federal coal lease expenditures									0.0				0.0
Income from equity affiliates									0.0				0.0
Predecessor | Corporate and Other
Segment Reporting Information [Line Items]
Revenues									35.3				8.2
Adjusted EBITDA									(35.6)				(368.1)
Additions to property, plant, equipment and mine development									0.1				2.1
Federal coal lease expenditures									0.0				0.0
Income from equity affiliates									$ (15.0)				$ (16.2)

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