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Other liabilities (Standby product loan facilities with various counterparties) (Details) - Product Loan [Member]
Dec. 31, 2022
lb
kg
UF6 conversion services [member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | kg 1,529,000
UF6 conversion services [member] | 2023 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | kg 331,000
UF6 conversion services [member] | 2024 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | kg 0
UF6 conversion services [member] | 2025 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | kg 287,000
UF6 conversion services [member] | 2026 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | kg 911,000
U3O8 [member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | lb 1,393,000
U3O8 [member] | 2023 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | lb 1,150,000
U3O8 [member] | 2024 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | lb 0
U3O8 [member] | 2025 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | lb 0
U3O8 [member] | 2026 [Member]  
Quantity of uranium drawn [Line Items]  
Product loans drawn | lb 243,000