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Commitments and contingencies - The Company Future LNG Purchase and Capacity Obligations (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Line of Credit Facility [Abstract]        
Costs incurred $ 111.5 $ 0.0 $ 138.3 $ 0.0