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Segment Information
 3 Months Ended
Mar. 31, 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 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 for the three months ended March 31, 2025 were as follows:
Seaborne ThermalSeaborne MetallurgicalPowder River BasinOther U.S. ThermalCorporate
and Other		Consolidated
 (Dollars in millions)
Revenue$265.1 $220.1 $275.6 $168.7 $7.5 $937.0 
Less Significant Segment Expenses:
Labor costs35.1 55.0 49.8 50.2 
Repair costs24.8 47.0 31.5 34.1 
Outside services26.8 72.1 31.1 35.8 
Commodities expense19.1 13.4 38.7 19.5 
Sales related costs54.6 54.0 75.3 10.0 
Other expenses (1)
20.5 (34.6)12.9 (13.8)
Adjusted EBITDA84.2 13.2 36.3 32.9 (22.6)144.0 
Additions to property, plant, equipment and mine development8.5 53.2 3.9 4.6 0.2 70.4 
Loss from equity affiliates— — — — 6.7 6.7 
Segment results for the three months ended March 31, 2024 were as follows:
Seaborne ThermalSeaborne MetallurgicalPowder River BasinOther U.S. ThermalCorporate
and Other		Consolidated
 (Dollars in millions)
Revenue$283.9 $247.0 $254.1 $191.6 $7.0 $983.6 
Less Significant Segment Expenses:
Labor costs37.7 49.3 51.8 52.9 
Repair costs37.9 32.7 34.9 32.4 
Outside services31.0 54.6 31.9 36.6 
Commodities expense23.9 15.7 41.1 19.3 
Sales related costs52.1 52.0 69.8 13.6 
Other expenses (1)
7.5 (5.6)8.2 (9.7)
Adjusted EBITDA93.8 48.3 16.4 46.5 (44.5)160.5 
Additions to property, plant, equipment and mine development14.539.45.02.30.261.4
Loss from equity affiliates— — — — 3.73.7 
(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.
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:
March 31, 2025December 31, 2024
(Dollars in millions)
Seaborne$2,434.6 $2,465.3 
U.S. Thermal1,315.0 1,346.9 
Corporate and Other2,034.1 2,141.5 
Total assets$5,783.7 $5,953.7 
A reconciliation of consolidated income from continuing operations before income taxes to Adjusted EBITDA follows:
Three Months Ended March 31,
20252024
 (Dollars in millions)
Income from continuing operations before incomes taxes$43.2 $65.8 
Depreciation, depletion and amortization92.1 79.8 
Asset retirement obligation expenses13.6 12.9 
Restructuring charges1.7 0.1 
Transaction costs related to business combinations2.4 — 
Provision for NARM loss— 1.8 
Changes in amortization of basis difference related to equity affiliates(0.6)(0.4)
Interest expense, net of capitalized interest11.5 14.7 
Interest income(15.4)(19.2)
Unrealized (gains) losses on foreign currency option contracts(4.3)5.7 
Take-or-pay contract-based intangible recognition(0.2)(0.7)
Total Adjusted EBITDA$144.0 $160.5