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Assets Under Development - Schedule Of Assets (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 12, 2025 | Feb. 14, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Extractive Industries Rollforward [Abstract] |  |  |  |
Opening balance |  |  | $ 2,261,197 | $ 1,562,828
Transferred from other non-current assets |  |  | 0 | 255,289
Transferred from vessels and equipment, net |  |  | 76,270 | 0
Additions |  |  | 510,175 | 347,209
Interest costs capitalized |  |  | 76,579 | 95,871
Reimbursement of capital spares invoiced to bp at COD |  |  | (43,152) | 0
Derecognition on commencement of sales-type lease (note 5) |  |  | (1,823,677) | 0
Closing balance |  |  | 1,057,392 | 2,261,197
FLNG Gimi |  |  |  |
Extractive Industries Rollforward [Abstract] |  |  |  |
Opening balance |  |  | 1,762,632 | 1,562,828
Transferred from other non-current assets |  |  | 0 | 0
Transferred from vessels and equipment, net |  |  | 0 | 0
Additions |  |  | 65,381 | 109,130
Interest costs capitalized |  |  | 38,816 | 90,674
Reimbursement of capital spares invoiced to bp at COD |  |  | (43,152) | 0
Derecognition on commencement of sales-type lease (note 5) | $ (1,823,700) |  | (1,823,677) | 0
Closing balance | $ 1,823,700 |  | 0 | 1,762,632
MKII FLNG |  |  |  |
Extractive Industries Rollforward [Abstract] |  |  |  |
Opening balance |  |  | 498,565 | 0
Transferred from other non-current assets |  |  | 0 | 255,289
Transferred from vessels and equipment, net |  | $ 76,300 | 76,270 | 0
Additions |  |  | 444,794 | 238,079
Interest costs capitalized |  |  | 37,763 | 5,197
Reimbursement of capital spares invoiced to bp at COD |  |  | 0 | 0
Derecognition on commencement of sales-type lease (note 5) |  |  | 0 | 0
Closing balance |  |  | $ 1,057,392 | $ 498,565

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