Background and basis of preparation (Details)	Sep. 30, 2024	Dec. 31, 2023
Subsidiaries | VRB Energy Inc
Investments subject to significant influence
Percentage of ownership interest acquired (in percent)	90.00%	90.00%
Subsidiaries | Computational Geosciences Inc
Investments subject to significant influence
Percentage of ownership interest acquired (in percent)	94.30%	94.30%
Subsidiaries | Cordoba Minerals Corp
Investments subject to significant influence
Percentage of ownership interest acquired (in percent)	62.70%	62.80%
Ma'aden Joint Venture
Investments subject to significant influence
Ownership percentage (in percent)	50.00%