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Segment Information Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reportable segment results
Revenues	$ 1,106.4	$ 1,412.6	$ 3,506.0	$ 4,184.7
Total Adjusted EBITDA	150.3	372.1	632.2	1,105.6
Net gain on disposals	1.1	20.8	2.8	49.8
Stanmore Coal Limited [Member]
Reportable segment results
Net gain on disposals		20.5		20.5
Iffley Land Transaction
Reportable segment results
Net gain on disposals				20.6
Red Mountain Joint Venture
Reportable segment results
Net gain on disposals				7.1
Seaborne Thermal Mining | Operating Segments
Reportable segment results
Revenues	249.5	305.1	720.7	773.9
Total Adjusted EBITDA	76.8	145.3	245.9	314.5
Seaborne Metallurgical Mining | Operating Segments
Reportable segment results
Revenues	216.3	370.3	831.7	1,254.0
Total Adjusted EBITDA	(16.2)	90.7	127.0	415.6
Powder River Basin Mining | Operating Segments
Reportable segment results
Revenues	333.6	373.7	903.5	1,084.5
Total Adjusted EBITDA	70.7	88.2	147.3	224.7
Midwestern U.S. Mining | Operating Segments
Reportable segment results
Revenues	176.0	208.5	522.6	607.7
Total Adjusted EBITDA	36.0	38.7	100.0	111.9
Western U.S. Mining | Operating Segments
Reportable segment results
Revenues	150.4	156.1	448.2	439.4
Total Adjusted EBITDA	46.3	28.5	141.3	94.4
Corporate and Other | Corporate, Non-Segment
Reportable segment results
Revenues	(19.4)	(1.1)	79.3	25.2
Total Adjusted EBITDA	$ (63.3)	$ (19.3)	$ (129.3)	$ (55.5)

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