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Management - Labor Relations (Details) | 12 Months Ended
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Dec. 31, 2025 numberOfEmployee
Concentration Risk [Line Items] |
Number of employees | 5,400
Number of hourly employees | 4,200
Hourly employees represented by organized labor unions (in percent) | 39.00%
Coal production generated by hourly employees represented by organized labor unions (in percent) | 18.00%
Represented by Organized Labor Union | Kayenta Mine |
Concentration Risk [Line Items] |
Number of employees | 30
Represented by Organized Labor Union | Shoal Creek |
Concentration Risk [Line Items] |
Number of employees | 290
Represented by Organized Labor Union | Wilpinjong Mine |
Concentration Risk [Line Items] |
Number of employees | 425
Represented by Organized Labor Union | Coppabella Mine |
Concentration Risk [Line Items] |
Number of employees | 305
Represented by Organized Labor Union | Moorvale Mine |
Concentration Risk [Line Items] |
Number of employees | 125
Represented by Organized Labor Union | Centurion Mine |
Concentration Risk [Line Items] |
Number of employees | 240
Represented by Organized Labor Union | CMJV Prep Plant |
Concentration Risk [Line Items] |
Number of employees | 10
Represented by Organized Labor Union | Metropolitan Underground Mine |
Concentration Risk [Line Items] |
Number of employees | 190
Represented by Organized Labor Union | Metropolitan Underground Mine - Deputies |
Concentration Risk [Line Items] |
Number of employees | 15
Represented by Organized Labor Union | Metropolitan Prep Plant |
Concentration Risk [Line Items] |
Number of employees | 20
Represented by Organized Labor Union | Wambo Prep Plant |
Concentration Risk [Line Items] |
Number of employees | 20

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