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Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Operating segment results

egment results for the year ended December 31, 2025 were as follows:

			Seaborne Thermal						Seaborne Metallurgical						Powder River Basin						Other U.S. Thermal						Reportable Segment Totals
			(Dollars in millions)
Revenue			$	908.5					$	1,036.6					$	1,153.0					$	707.3					$	3,805.4
Less Significant Segment Expenses:
Labor costs			140.3						246.1						212.7						205.3
Repair costs			113.0						195.6						145.4						150.0
Outside services			111.5						355.0						130.3						147.7
Commodities expense			80.6						58.7						160.8						76.3
Sales related costs			196.3						238.2						281.1						43.1
Other expenses (1)			44.6						(113.4)						46.9						13.5
Adjusted EBITDA			222.2						56.4						175.8						71.4						525.8
Additions to property, plant, equipment and mine development			39.8						309.4						33.1						24.0						406.3

Reportable segment results for the year ended December 31, 2024 were as follows:

			Seaborne Thermal						Seaborne Metallurgical						Powder River Basin						Other U.S. Thermal						Reportable Segment Totals
			(Dollars in millions)
Revenue			$	1,213.9					$	1,055.6					$	1,098.8					$	822.6					$	4,190.9
Less Significant Segment Expenses:
Labor costs			157.2						212.7						206.8						218.6
Repair costs			152.8						190.8						131.7						141.0
Outside services			128.7						258.9						123.2						146.8
Commodities expense			88.6						59.6						158.5						77.0
Sales related costs			224.3						231.6						297.5						53.0
Other expenses (1)			32.3						(140.5)						42.5						35.4
Adjusted EBITDA			430.0						242.5						138.6						150.8						961.9
Additions to property, plant, equipment and mine development			73.2						266.6						35.0						18.6						393.4

Reportable segment results for the year ended December 31, 2023 were as follows:

			Seaborne Thermal						Seaborne Metallurgical						Powder River Basin						Other U.S. Thermal						Reportable Segment Totals
			(Dollars in millions)
Revenue			$	1,329.7					$	1,301.9					$	1,198.1					$	888.2					$	4,717.9
Less Significant Segment Expenses:
Labor costs			148.8						187.2						201.1						218.8
Repair costs			154.4						151.3						154.9						153.4
Outside services			122.7						205.1						138.0						176.2
Commodities expense			97.0						61.5						180.2						102.7
Sales related costs			207.4						259.0						341.9						58.7
Other expenses (1)			22.6						(0.3)						28.3						(29.1)
Adjusted EBITDA			576.8						438.1						153.7						207.5						1,376.1
Additions to property, plant, equipment and mine development			62.0						186.4						40.9						47.6						336.9

(1)    Other expenses for the mining operations primarily include lease expense; non-sales related taxes; insurance expense; and joint facility charges; offset by credits related to the capitalization of costs to the consolidated balance sheet. For the year ended December 31, 2024, the Seaborne Metallurgical reportable segment includes $80.8 million related to the portion of the Shoal Creek insurance recovery that was applicable to incremental costs and business interruption recoveries.

Reconciliation of Assets from Segment to Consolidated

The following table presents total assets at the division level:

			December 31,
			2025						2024						2023
			(Dollars in millions)
Seaborne			$	2,543.4					$	2,465.3					$	2,088.2
U.S. Thermal			1,301.7						1,346.9						1,373.2
Corporate and Other			1,962.1						2,141.5						2,500.7
Total assets			$	5,807.2					$	5,953.7					$	5,962.1

Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations

A reconciliation of reportable segment totals follows:

			Year Ended December 31,
			2025						2024						2023
			(Dollars in millions)
Revenue from reportable segments			$	3,805.4					$	4,190.9					$	4,717.9
Reconciling items
Corporate and Other (1)			56.1						45.8						228.8
Revenue			$	3,861.5					$	4,236.7					$	4,946.7
Adjusted EBITDA from reportable segments			$	525.8					$	961.9					$	1,376.1
Reconciling items
Corporate and Other (1)			(70.9)						(90.2)						(12.2)
Depreciation, depletion and amortization			(384.5)						(343.0)						(321.4)
Asset retirement obligation expenses			(36.5)						(48.9)						(50.5)
Restructuring charges			(9.5)						(4.4)						(3.3)
Costs related to terminated acquisition			(78.9)						(10.3)						—
Shoal Creek insurance recovery - property damage			—						28.7						—
Changes in amortization of basis difference related to equity affiliates			2.7						1.8						1.6
Other operating loss			(5.6)						(3.7)						(42.9)
Interest expense, net of capitalized interest			(43.9)						(46.9)						(59.8)
Net loss on early debt extinguishment			—						—						(8.8)
Interest income			55.4						71.0						76.8
Net mark-to-market adjustment on actuarially determined liabilities			5.4						6.1						0.3
Unrealized gains on derivative contracts related to forecasted sales			—						—						159.0
Unrealized gains (losses) on foreign currency option contracts			6.0						(9.0)						7.4
Take-or-pay contract-based intangible recognition			1.0						3.0						2.5
(Loss) income from continuing operations before incomes taxes			$	(33.5)					$	516.1					$	1,124.8
Additions to property, plant, equipment and mine development from reportable segments			$	406.3					$	393.4					$	336.9
Reconciling items
Corporate and Other			5.1						7.9						11.4
Additions to property, plant, equipment and mine development			$	411.4					$	401.3					$	348.3

(1)    Corporate and Other includes selling and administrative expenses, results from equity method investments, trading and brokerage activities, minimum charges on certain transportation-related contracts, the closure of inactive mining sites, the impact of foreign currency remeasurement and certain commercial matters.

Revenues as a percent of total revenue from external customers by geographic region

The following table presents revenue as a percent of total revenue from external customers by geographic region:

			Year Ended December 31,
			2025						2024						2023
U.S.			48.4		%				45.0		%				42.4		%
Japan			15.9		%				18.8		%				14.7		%
Australia			7.9		%				8.8		%				8.9		%
China			7.5		%				11.3		%				10.9		%
India			5.6		%				1.2		%				1.2		%
Indonesia			2.2		%				2.4		%				2.0		%
South Korea			2.2		%				0.6		%				—		%
Taiwan			2.0		%				3.3		%				6.6		%
Vietnam			1.8		%				0.9		%				2.4		%
Brazil			1.5		%				2.0		%				3.6		%
Belgium			1.0		%				1.3		%				0.6		%
France			0.8		%				1.1		%				1.6		%
Malaysia			0.6		%				1.5		%				0.9		%
Germany			0.3		%				0.2		%				1.0		%
Other			2.3		%				1.6		%				3.2		%
Total			100.0		%				100.0		%				100.0		%

Long-Lived Assets by Geographic Areas

The following table presents the geographic location of the Company’s long-lived assets:

			December 31,
			2025						2024						2023
			(Dollars in millions)
U.S.			$	1,334.4					$	1,432.1					$	1,523.1
Australia			1,818.9						1,649.4						1,321.0
Property, plant, equipment and mine development, net			$	3,153.3					$	3,081.5					$	2,844.1
U.S.			$	96.0					$	85.6					$	28.7
Australia			25.1						33.7						33.1
Other			0.1						—						0.1
Operating lease right-of-use assets			$	121.2					$	119.3					$	61.9

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