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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Apr. 01, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Predecessor
Segment Reporting Information [Line Items]
Revenues	$ 0.0				$ 1,326.2	$ 1,326.2	$ 1,440.8	$ 1,207.1	$ 1,040.2	$ 1,027.2		$ 4,715.3	$ 5,609.2
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					341.3							532.0	432.4
Payments to Acquire Property, Plant, and Equipment					32.8							126.6	126.8
Federal coal lease expenditures					0.5							249.0	277.2
(Income) loss from equity affiliates					(15.0)	$ (15.0)	$ (28.8)					(16.2)	15.9
Predecessor | Powder River Basin Mining [Member]
Segment Reporting Information [Line Items]
Revenues					394.3							1,473.3	1,865.9
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					91.7							379.9	482.9
Payments to Acquire Property, Plant, and Equipment					19.3							33.0	15.0
Federal coal lease expenditures					0.0							248.4	276.9
(Income) loss from equity affiliates					0.0							0.0	0.0
Predecessor | Midwestern U.S. Mining [Member]
Segment Reporting Information [Line Items]
Revenues					193.2							792.5	981.2
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					50.0							217.3	269.7
Payments to Acquire Property, Plant, and Equipment					2.8							18.7	51.3
Federal coal lease expenditures					0.0							0.0	0.0
(Income) loss from equity affiliates					0.0							0.0	0.0
Predecessor | Western U.S. Mining [Member]
Segment Reporting Information [Line Items]
Revenues					149.7							526.0	682.3
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					50.0							101.6	184.6
Payments to Acquire Property, Plant, and Equipment					3.1							20.8	19.3
Federal coal lease expenditures					0.5							0.6	0.3
(Income) loss from equity affiliates					0.0							0.0	0.0
Predecessor | Australian Metallurgical Mining [Member]
Segment Reporting Information [Line Items]
Revenues					328.9							1,090.4	1,181.9
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					109.6							(16.3)	(18.2)
Payments to Acquire Property, Plant, and Equipment					5.2							29.9	25.5
Federal coal lease expenditures					0.0							0.0	0.0
(Income) loss from equity affiliates					0.0							0.0	0.0
Predecessor | Australian Thermal Mining [Member]
Segment Reporting Information [Line Items]
Revenues					224.8							824.9	823.5
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					75.6							217.6	193.6
Payments to Acquire Property, Plant, and Equipment					2.3							22.1	13.6
Federal coal lease expenditures					0.0							0.0	0.0
(Income) loss from equity affiliates					0.0							0.0	0.0
Predecessor | Trading and Brokerage
Segment Reporting Information [Line Items]
Revenues					15.0							28.9	40.6
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					8.8							(32.4)	24.8
Payments to Acquire Property, Plant, and Equipment					0.0							0.0	0.0
Federal coal lease expenditures					0.0							0.0	0.0
(Income) loss from equity affiliates					0.0							0.0	0.0
Predecessor | Corporate and Other
Segment Reporting Information [Line Items]
Revenues					20.3							(20.7)	33.8
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization					(44.4)							(335.7)	(705.0)
Payments to Acquire Property, Plant, and Equipment					0.1							2.1	2.1
Federal coal lease expenditures					0.0							0.0	0.0
(Income) loss from equity affiliates					$ (15.0)							$ (16.2)	$ 15.9
Successor
Segment Reporting Information [Line Items]
Revenues		$ 1,517.1	$ 1,477.2	$ 1,258.3							$ 4,252.6
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											1,145.3
Payments to Acquire Property, Plant, and Equipment											166.6
Federal coal lease expenditures											0.0
(Income) loss from equity affiliates		$ (22.8)	$ (10.5)	$ (15.7)							(49.0)
Successor | Powder River Basin Mining [Member]
Segment Reporting Information [Line Items]
Revenues											1,178.7
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											278.8
Payments to Acquire Property, Plant, and Equipment											32.6
(Income) loss from equity affiliates											0.0
Successor | Midwestern U.S. Mining [Member]
Segment Reporting Information [Line Items]
Revenues											592.3
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											124.4
Payments to Acquire Property, Plant, and Equipment											21.7
(Income) loss from equity affiliates											0.0
Successor | Western U.S. Mining [Member]
Segment Reporting Information [Line Items]
Revenues											440.7
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											131.8
Payments to Acquire Property, Plant, and Equipment											13.8
(Income) loss from equity affiliates											0.0
Successor | Australian Metallurgical Mining [Member]
Segment Reporting Information [Line Items]
Revenues											1,221.0
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											414.9
Payments to Acquire Property, Plant, and Equipment											56.0
(Income) loss from equity affiliates											0.0
Successor | Australian Thermal Mining [Member]
Segment Reporting Information [Line Items]
Revenues											772.5
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											306.6
Payments to Acquire Property, Plant, and Equipment											39.2
(Income) loss from equity affiliates											0.0
Successor | Trading and Brokerage
Segment Reporting Information [Line Items]
Revenues											33.6
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											(6.9)
Payments to Acquire Property, Plant, and Equipment											0.0
(Income) loss from equity affiliates											0.0
Successor | Corporate and Other
Segment Reporting Information [Line Items]
Revenues											13.8
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization											(104.3)
Payments to Acquire Property, Plant, and Equipment											3.3
(Income) loss from equity affiliates											$ (49.0)

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