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Segment Information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reportable segment results
Revenue	$ 1,321.9	$ 723.4	$ 2,013.3	$ 1,374.7
Adjusted EBITDA	577.8	122.1	905.3	183.2
Seaborne Thermal Mining
Reportable segment results
Revenue	354.9	194.1	606.1	370.5
Adjusted EBITDA	176.8	71.4	267.3	99.9
Seaborne Metallurgical Mining
Reportable segment results
Revenue	533.8	121.0	855.1	208.5
Adjusted EBITDA	299.7	(26.4)	480.7	(48.8)
Powder River Basin Mining
Reportable segment results
Revenue	229.7	248.6	480.9	477.0
Adjusted EBITDA	(2.0)	45.5	5.6	75.6
Other U.S. Thermal Mining
Reportable segment results
Revenue	224.9	162.1	428.0	311.4
Adjusted EBITDA	61.9	44.3	111.9	80.5
Corporate and Other (1)
Reportable segment results
Revenue	(21.4)	(2.4)	(356.8)	7.3
Adjusted EBITDA	$ 41.4	$ (12.7)	$ 39.8	$ (24.0)

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