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Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 846.2	$ 1,250.6
Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	651.4	866.3
Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	192.5	323.7
Other
Disaggregation of Revenue [Line Items]
Revenues	2.3	60.6
Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	487.7	647.4
Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	163.7	218.9
Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	192.5	323.7
Seaborne Thermal Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	201.1	251.0
Seaborne Thermal Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	200.2	250.3
Seaborne Thermal Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Seaborne Thermal Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.9	0.7
Seaborne Thermal Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	36.5	38.4
Seaborne Thermal Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	163.7	211.9
Seaborne Thermal Mining | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	193.2	324.5
Seaborne Metallurgical Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	192.5	323.7
Seaborne Metallurgical Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.7	0.8
Seaborne Metallurgical Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	192.5	323.7
Powder River Basin Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	266.6	287.3
Powder River Basin Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	266.6	287.3
Powder River Basin Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Powder River Basin Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Powder River Basin Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	266.6	287.3
Powder River Basin Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Powder River Basin Mining | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Other U.S. Thermal Mining [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	192.3	334.8
Other U.S. Thermal Mining [Member] | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	184.6	328.7
Other U.S. Thermal Mining [Member] | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Other U.S. Thermal Mining [Member] | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	7.7	6.1
Other U.S. Thermal Mining [Member] | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	184.6	321.7
Other U.S. Thermal Mining [Member] | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	7.0
Other U.S. Thermal Mining [Member] | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Corporate and Other | Corporate, Non-Segment
Disaggregation of Revenue [Line Items]
Revenues	(7.0)	53.0
Corporate and Other | Corporate, Non-Segment | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	(7.0)	53.0
Corporate and Other | Corporate, Non-Segment | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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