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Segment Information Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reportable segment results
Revenues	$ 626.7	$ 1,149.0	$ 1,472.9	$ 2,399.6
Adjusted EBITDA	23.4	230.0	60.2	484.1
Seaborne Thermal Mining | Operating Segments
Reportable segment results
Revenues	162.0	220.2	363.1	471.2
Adjusted EBITDA	27.7	74.4	82.8	169.1
Seaborne Metallurgical Mining | Operating Segments
Reportable segment results
Revenues	91.6	290.9	284.8	615.4
Adjusted EBITDA	(36.1)	57.4	(68.8)	143.2
Powder River Basin Mining | Operating Segments
Reportable segment results
Revenues	205.8	282.6	472.4	569.9
Adjusted EBITDA	39.3	40.2	64.7	76.6
Other U.S. Thermal Mining | Operating Segments
Reportable segment results
Revenues	152.0	309.6	344.3	644.4
Adjusted EBITDA	32.9	83.1	71.4	159.0
Corporate and Other | Corporate, Non-Segment
Reportable segment results
Revenues	15.3	45.7	8.3	98.7
Adjusted EBITDA	$ (40.4)	$ (25.1)	$ (89.9)	$ (63.8)

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