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Management - Labor Relations
 12 Months Ended
Dec. 31, 2025
Risks and Uncertainties [Abstract]  
Management - Labor Relations Management — Labor Relations
On December 31, 2025, the Company had approximately 5,400 employees worldwide, including approximately 4,200 hourly employees; the employee amounts exclude employees that were employed at operations classified as discontinued operations. Approximately 39% of those hourly employees were represented by organized labor unions and were employed by mines that generated 18% of the Company’s 2025 coal production from continuing operations. In the U.S., the hourly employees of one active mine and one inactive mine are represented by an organized labor union. In Australia, the coal mining industry is unionized and the majority of hourly workers employed at the Company’s Australian mining operations are members of trade unions. The Mining and Energy Union (MEU) generally represents the Company’s Australian subsidiaries’ hourly production and engineering employees, including those employed through contract mining relationships.
The following table presents the Company’s active and inactive mining operations as of December 31, 2025 in which the employees are represented by organized labor unions:
MineApproximate Number of Active Employees RepresentedUnionCurrent Agreement Expiration Date or Date Amendable
U.S.
Kayenta 30UMWANovember 2029
Shoal Creek 290UMWAJune 2029
Australia
Wilpinjong425MEUMay 2028
Coppabella (1)
305MEUDecember 2025
Moorvale125MEUMay 2028
Centurion240N/AJanuary 2028
CMJV
Handling and preparation plant employees10MEUApril 2027
Metropolitan
Underground employees - Production190MEUJuly 2028
Underground employees - Deputies15MEUJuly 2026
Handling and preparation plant employees20MEUJanuary 2027
Wambo
Handling and preparation plant employees (1)
20MEUAugust 2025
(1)    The Company is currently negotiating a new labor agreement with the MEU and employees.