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Segment Information
 6 Months Ended
Jun. 30, 2025
Segment Reporting [Abstract]  
Segment Information Segment Information
The Company reports its results of operations primarily through the following reportable segments: Seaborne Thermal, Seaborne Metallurgical, Powder River Basin, Other U.S. Thermal and Corporate and Other.
The Company’s chief operating decision maker (CODM), defined as the President and Chief Executive Officer, uses Adjusted EBITDA as the primary financial metric to measure each segment’s operating performance against expected results and to allocate resources, including capital investment in mining operations and potential expansions. Adjusted EBITDA is a non-GAAP financial measure defined as (loss) income from continuing operations before deducting net interest expense, income taxes, asset retirement obligation expenses and depreciation, depletion and amortization. Adjusted EBITDA is also adjusted for the discrete items that management excluded in analyzing the segments’ operating performance, as displayed in the reconciliations below. Management believes this non-GAAP measure is used by investors to measure the Company’s operating performance. Adjusted EBITDA is not intended to serve as an alternative to U.S. GAAP measures of performance and may not be comparable to similarly-titled measures presented by other companies.
Segment results were as follows:
Three Months Ended June 30, 2025
Seaborne ThermalSeaborne MetallurgicalPowder River BasinOther U.S. ThermalCorporate
and Other		Consolidated
 (Dollars in millions)
Revenue$195.1 $252.2 $275.7 $155.1 $12.0 $890.1 
Less Significant Segment Expenses:
Labor costs37.7 61.3 52.9 48.9 
Repair costs29.0 41.4 32.6 39.6 
Outside services26.9 85.8 28.8 37.6 
Commodities expense19.9 12.6 35.8 17.7 
Sales related costs44.8 58.7 73.9 9.4 
Other expenses (1)
3.3 1.6 8.7 (11.6)
Adjusted EBITDA33.5 (9.2)43.0 13.5 12.5 93.3 
Additions to property, plant, equipment and mine development9.6 72.9 5.5 5.4 0.8 94.2 
Loss from equity affiliates— — — — 0.9 0.9 
Three Months Ended June 30, 2024
Seaborne ThermalSeaborne MetallurgicalPowder River BasinOther U.S. ThermalCorporate
and Other		Consolidated
 (Dollars in millions)
Revenue$307.5 $294.3 $221.9 $202.0 $16.3 $1,042.0 
Less Significant Segment Expenses:
Labor costs41.4 52.4 49.5 55.1 
Repair costs36.0 43.5 26.1 35.8 
Outside services31.3 54.7 26.0 36.4 
Commodities expense22.5 15.9 34.4 19.8 
Sales related costs52.6 62.0 60.3 12.1 
Other expenses (1)
19.3 (77.8)7.8 7.4 
Adjusted EBITDA104.4 143.6 17.8 35.4 8.5 309.7 
Additions to property, plant, equipment and mine development18.2 75.8 7.5 2.8 1.3 105.6
Loss from equity affiliates— — — — 1.3 1.3 
Six Months Ended June 30, 2025
Seaborne ThermalSeaborne MetallurgicalPowder River BasinOther U.S. ThermalCorporate
and Other		Consolidated
 (Dollars in millions)
Revenue$460.2 $472.3 $551.3 $323.8 $19.5 $1,827.1 
Less Significant Segment Expenses:
Labor costs72.8 116.3 102.7 99.1 
Repair costs53.8 88.4 64.1 73.7 
Outside services53.7 157.9 59.9 73.4 
Commodities expense39.0 26.0 74.5 37.2 
Sales related costs99.4 112.7 149.2 19.4 
Other expenses (1)
23.8 (33.0)21.6 (25.4)
Adjusted EBITDA117.7 4.0 79.3 46.4 (10.1)237.3 
Additions to property, plant, equipment and mine development18.1 126.1 9.4 10.0 1.0 164.6 
Loss from equity affiliates— — — — 7.6 7.6 
Six Months Ended June 30, 2024
Seaborne ThermalSeaborne MetallurgicalPowder River BasinOther U.S. ThermalCorporate
and Other		Consolidated
 (Dollars in millions)
Revenue$591.4 $541.3 $476.0 $393.6 $23.3 $2,025.6 
Less Significant Segment Expenses:
Labor costs79.1 101.7 101.3 108.0 
Repair costs73.9 76.2 61.0 68.2 
Outside services62.3 109.3 57.9 73.0 
Commodities expense46.4 31.6 75.5 39.1 
Sales related costs104.7 114.0 130.1 25.7 
Other expenses (1)
26.8 (83.4)16.0 (2.3)
Adjusted EBITDA198.2 191.9 34.2 81.9 (36.0)470.2 
Additions to property, plant, equipment and mine development32.7 115.2 12.5 5.1 1.5 167.0
Loss from equity affiliates— — — — 5.0 5.0 
(1)    Other expenses for the mining operations primarily include lease expense; non-sales related taxes; insurance expense; joint facility charges; and credits related to the capitalization of costs to the balance sheet. For the three and six months ended June 30, 2024, the Seaborne Metallurgical 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.
Total assets are reflected at the division level only for the Company’s operating segments and are not allocated between each individual segment as such information is not regularly reviewed by the Company’s CODM. Further, some assets service more than one segment within the division and an allocation of such assets would not be meaningful or representative on a segment by segment basis. Assets related to closed, suspended or otherwise inactive mines are included within the Corporate and Other category.
The following table presents total assets at the division level:
June 30, 2025December 31, 2024
(Dollars in millions)
Seaborne$2,455.2 $2,465.3 
U.S. Thermal1,309.3 1,346.9 
Corporate and Other1,998.9 2,141.5 
Total assets$5,763.4 $5,953.7 
A reconciliation of consolidated (loss) income from continuing operations before income taxes to Adjusted EBITDA follows:
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
 (Dollars in millions)
(Loss) income from continuing operations before incomes taxes$(28.3)$250.2 $14.9 $316.0 
Depreciation, depletion and amortization93.4 82.9 185.5 162.7 
Asset retirement obligation expenses13.8 12.9 27.4 25.8 
Restructuring charges3.5 0.1 5.2 0.2 
Transaction costs related to business combinations18.8 — 21.2 — 
Provision for NARM loss— 1.9 — 3.7 
Shoal Creek insurance recovery - property damage— (28.7)— (28.7)
Changes in amortization of basis difference related to equity affiliates(0.8)(0.3)(1.4)(0.7)
Interest expense, net of capitalized interest11.1 10.7 22.6 25.4 
Interest income(13.8)(16.8)(29.2)(36.0)
Unrealized (gains) losses on foreign currency option contracts(4.1)(2.4)(8.4)3.3 
Take-or-pay contract-based intangible recognition(0.3)(0.8)(0.5)(1.5)
Total Adjusted EBITDA$93.3 $309.7 $237.3 $470.2