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Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 626.7	$ 1,149.0	$ 1,472.9	$ 2,399.6
Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	511.7	804.9	1,163.1	1,671.2
Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	91.4	290.3	283.9	614.0
Other
Disaggregation of Revenue [Line Items]
Revenues	23.6	53.8	25.9	114.4
Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	388.2	618.4	875.9	1,265.8
Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	123.5	186.5	287.2	405.4
Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	91.4	290.3	283.9	614.0
Seaborne Thermal Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	162.0	220.2	363.1	471.2
Seaborne Thermal Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	161.8	219.9	362.0	470.2
Seaborne Thermal Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Seaborne Thermal Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.2	0.3	1.1	1.0
Seaborne Thermal Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	38.3	37.7	74.8	76.1
Seaborne Thermal Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	123.5	182.2	287.2	394.1
Seaborne Thermal Mining | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	91.6	290.9	284.8	615.4
Seaborne Metallurgical Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	91.4	290.3	283.9	614.0
Seaborne Metallurgical Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.2	0.6	0.9	1.4
Seaborne Metallurgical Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Seaborne Metallurgical Mining | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	91.4	290.3	283.9	614.0
Powder River Basin Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	205.8	282.6	472.4	569.9
Powder River Basin Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	205.8	282.5	472.4	569.8
Powder River Basin Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Powder River Basin Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.1	0.0	0.1
Powder River Basin Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	205.8	282.5	472.4	569.8
Powder River Basin Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Powder River Basin Mining | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Other U.S. Thermal Mining [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	152.0	309.6	344.3	644.4
Other U.S. Thermal Mining [Member] | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	144.1	302.5	328.7	631.2
Other U.S. Thermal Mining [Member] | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Other U.S. Thermal Mining [Member] | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	7.9	7.1	15.6	13.2
Other U.S. Thermal Mining [Member] | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	144.1	298.2	328.7	619.9
Other U.S. Thermal Mining [Member] | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	4.3	0.0	11.3
Other U.S. Thermal Mining [Member] | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Corporate and Other | Corporate, Non-Segment
Disaggregation of Revenue [Line Items]
Revenues	15.3	45.7	8.3	98.7
Corporate and Other | Corporate, Non-Segment | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	15.3	45.7	8.3	98.7
Corporate and Other | Corporate, Non-Segment | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Corporate and Other | Corporate, Non-Segment | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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