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Revenues - Revenue by Product Type and Market (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 1,250.6	$ 1,462.7
Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	866.3	930.1
Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	323.7	465.3
Other
Disaggregation of Revenue [Line Items]
Revenues	60.6	67.3
Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	647.4	756.5
Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	218.9	173.6
Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	323.7	465.3
Seaborne Thermal Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	251.0	201.4
Seaborne Thermal Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	250.3	201.0
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	0.7	0.4
Seaborne Thermal Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	38.4	36.1
Seaborne Thermal Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	211.9	164.9
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	324.5	466.2
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	323.7	465.3
Seaborne Metallurgical Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.8	0.9
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	323.7	465.3
Powder River Basin Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	287.3	389.3
Powder River Basin Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	287.3	389.2
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	0.1
Powder River Basin Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	287.3	389.2
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
Midwestern U.S. Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	179.1	201.7
Midwestern U.S. Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	179.0	201.6
Midwestern U.S. Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Midwestern U.S. Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	0.1	0.1
Midwestern U.S. Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	179.0	200.9
Midwestern U.S. Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.7
Midwestern U.S. Mining | Operating Segments | Export | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Western U.S. Mining | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	155.7	143.7
Western U.S. Mining | Operating Segments | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	149.7	138.3
Western U.S. Mining | Operating Segments | Metallurgical coal
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Western U.S. Mining | Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenues	6.0	5.4
Western U.S. Mining | Operating Segments | Domestic | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	142.7	130.3
Western U.S. Mining | Operating Segments | Export | Thermal coal
Disaggregation of Revenue [Line Items]
Revenues	7.0	8.0
Western U.S. Mining | 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	53.0	60.4
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	53.0	60.4
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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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