Stanwell Liabilities (Tables)	6 Months Ended
Stanwell Liabilities (Tables)	Jun. 30, 2026
Stanwell Liabilities [Abstract]
Schedule of Contract Obligations	(in US$ thousands) June 30, 2026 December 31, 2025 Current Stanwell Reserved Area deferred consideration $ 15,805 $ — Stanwell Prepaid coal supply liability 13,104 — $ 28,909 $ — Non-current Stanwell Reserved Area deferred consideration $ 362,318 $ 346,768 Stanwell Prepaid coal supply liability 164,902 155,027 Stanwell Prepayment and deferred payment 65,270 — $ 592,490 $ 501,795