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Segment and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Operating segment results
Segment results for the year ended December 31, 2023 were as follows:
Seaborne ThermalSeaborne Metallurgical Powder River Basin Other U.S. ThermalCorporate
and Other
Consolidated
 (Dollars in millions)
Revenue$1,329.7 $1,301.9 $1,198.1 $888.2 $228.8 $4,946.7 
Adjusted EBITDA576.8 438.1 153.7 207.5 (12.2)1,363.9 
Additions to property, plant, equipment and mine development
62.0 186.4 40.9 47.6 11.4 348.3 
Income from equity affiliates— — — — (6.9)(6.9)
Segment results for the year ended December 31, 2022 were as follows:
Seaborne ThermalSeaborne Metallurgical Powder River BasinOther U.S. ThermalCorporate
and Other
Consolidated
 (Dollars in millions)
Revenue$1,345.6 $1,616.9 $1,065.5 $952.2 $1.7 $4,981.9 
Adjusted EBITDA647.6 781.7 68.2 242.4 104.8 1,844.7 
Additions to property, plant, equipment and mine development
38.8 84.8 59.1 35.3 3.5 221.5 
Income from equity affiliates— — — — (131.2)(131.2)
Segment results for the year ended December 31, 2021 were as follows:
Seaborne ThermalSeaborne Metallurgical Powder River BasinOther U.S. ThermalCorporate
and Other
Consolidated
 (Dollars in millions)
Revenue$934.0 $727.7 $971.2 $689.1 $(3.7)$3,318.3 
Adjusted EBITDA353.1 178.2 134.9 164.2 86.3 916.7 
Additions to property, plant, equipment and mine development
88.6 25.1 41.4 24.2 3.8 183.1 
Income from equity affiliates— — — — (82.1)(82.1)
Reconciliation of Assets from Segment to Consolidated
Assets as of December 31, 2023 were as follows:
SeaborneU.S. ThermalCorporate
and Other
Consolidated
(Dollars in millions)
Total assets$2,088.2 $1,373.2 $2,500.7 $5,962.1 
Property, plant, equipment and mine development, net
1,565.1 1,149.2 129.8 2,844.1 
Operating lease right-of-use assets33.1 25.0 3.8 61.9 
Assets as of December 31, 2022 were as follows:
SeaborneU.S. ThermalCorporate
and Other
Consolidated
(Dollars in millions)
Total assets$1,632.6 $1,359.4 $2,618.8 $5,610.8 
Property, plant, equipment and mine development, net
1,220.7 1,217.5 426.8 2,865.0 
Operating lease right-of-use assets20.5 0.5 5.9 26.9 
Assets as of December 31, 2021 were as follows:
SeaborneU.S. ThermalCorporate
and Other
Consolidated
(Dollars in millions)
Total assets$1,669.6 $1,318.5 $1,961.7 $4,949.8 
Property, plant, equipment and mine development, net
1,298.8 1,209.5 442.3 2,950.6 
Operating lease right-of-use assets19.2 3.3 13.0 35.5 
Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations
A reconciliation of consolidated income from continuing operations, net of income taxes to Adjusted EBITDA follows:
 Year Ended December 31,
 202320222021
 (Dollars in millions)
Income from continuing operations, net of income taxes$816.0 $1,317.4 $347.4 
Depreciation, depletion and amortization321.4 317.6 308.7 
Asset retirement obligation expenses50.5 49.4 44.7 
Restructuring charges3.3 2.9 8.3 
Asset impairment2.0 11.2 — 
Provision for NARM and Shoal Creek losses40.9 — — 
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates(1.6)(2.3)(33.8)
Interest expense59.8 140.3 183.4 
Net loss (gain) on early debt extinguishment8.8 57.9 (33.2)
Interest income(76.8)(18.4)(6.5)
Net mark-to-market adjustment on actuarially determined liabilities
(0.3)(27.8)(43.4)
Unrealized (gains) losses on derivative contracts related to forecasted sales(159.0)35.8 115.1 
Unrealized (gains) losses on foreign currency option contracts(7.4)2.3 7.5 
Take-or-pay contract-based intangible recognition(2.5)(2.8)(4.3)
Income tax provision (benefit)308.8 (38.8)22.8 
Total Adjusted EBITDA$1,363.9 $1,844.7 $916.7 
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,
 202320222021
U.S.42.4 %36.6 %45.5 %
Japan14.7 %19.4 %14.2 %
China10.9 %— %— %
Australia8.9 %8.5 %7.7 %
Taiwan6.6 %9.3 %14.4 %
Brazil3.6 %2.8 %0.9 %
Vietnam2.4 %2.8 %2.0 %
Indonesia2.0 %1.5 %3.0 %
France1.6 %1.1 %— %
India1.2 %2.9 %5.4 %
Germany1.0 %0.7 %— %
Belgium0.6 %1.3 %— %
South Korea— %2.1 %1.4 %
Chile— %1.1 %0.3 %
Other4.1 %9.9 %5.2 %
Total100.0 %100.0 %100.0 %