v3.25.4
Contract Obligations (Summary of Contract Obligations) (Details)
$ in Thousands, $ in Millions
Dec. 31, 2025
AUD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]      
Short-term   $ 22,445 $ 37,090
Long-term   522,968 312,822
Total   545,413 349,912
Coal Leases Contract Liability [Member]      
Debt Instrument [Line Items]      
Short-term   843 843
Long-term   18,818 19,156
Total   19,661 19,999
Stanwell Prepaid Coal Supply Liability [Member]      
Debt Instrument [Line Items]      
Contract liability, short-term   0  
Contract liability, long-term $ 231.6 155,027  
Contract liability, Total   155,027  
Stanwell Below Market Coal Supply Agreement [Member]      
Debt Instrument [Line Items]      
Short-term   21,602 36,247
Long-term   2,355 8,616
Total   23,957 44,863
Stanwell Deferred Consideration Liability [Member]      
Debt Instrument [Line Items]      
Deferred consideration liability, short-term   0 0
Deferred consideration liability, long-term   346,768 285,050
Deferred consideration liability, Total   $ 346,768 $ 285,050