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Segment Information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reportable segment results
Revenue	$ 1,342.5	$ 679.0	$ 3,355.8	$ 2,053.7
Adjusted EBITDA	438.9	289.1	1,344.2	472.3
Seaborne Thermal Mining
Reportable segment results
Revenue	353.2	260.7	959.3	631.2
Adjusted EBITDA	171.2	104.4	438.5	204.3
Seaborne Metallurgical Mining
Reportable segment results
Revenue	310.7	179.5	1,165.8	388.0
Adjusted EBITDA	113.2	57.4	593.9	8.6
Powder River Basin Mining
Reportable segment results
Revenue	290.5	247.1	771.4	724.1
Adjusted EBITDA	37.9	37.0	43.5	112.6
Other U.S. Thermal Mining
Reportable segment results
Revenue	261.4	184.6	689.4	496.0
Adjusted EBITDA	72.7	45.1	184.6	125.6
Corporate and Other (1)
Reportable segment results
Revenue	126.7	(192.9)	(230.1)	(185.6)
Adjusted EBITDA	$ 43.9	$ 45.2	$ 83.7	$ 21.2

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