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Segment Information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reportable segment results
Revenues	$ 1,088.0	$ 1,078.9	$ 3,113.6	$ 3,711.7
Adjusted EBITDA	224.8	270.0	695.0	1,018.8
Seaborne Thermal
Reportable segment results
Revenues	313.2	297.4	904.6	1,043.4
Adjusted EBITDA	120.0	115.5	318.2	477.0
Seaborne Metallurgical
Reportable segment results
Revenues	242.5	247.0	783.8	907.9
Adjusted EBITDA	27.8	78.6	219.7	271.9
Powder River Basin
Reportable segment results
Revenues	305.3	313.0	781.3	878.0
Adjusted EBITDA	51.7	54.1	85.9	116.1
Other U.S. Thermal
Reportable segment results
Revenues	216.7	228.2	610.3	677.5
Adjusted EBITDA	28.4	49.1	110.3	165.2
Corporate and Other (1)
Reportable segment results
Revenues	10.3	(6.7)	33.6	204.9
Adjusted EBITDA	$ (3.1)	$ (27.3)	$ (39.1)	$ (11.4)

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