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Provision for Reclamation Liabilities (Details) - CAD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Provision for Reclamation Liabilities (Details) [Line Items]        
Estimated discounted cash flows of future reclamation costs   $ 5.6   $ 8.4
Undiscounted future cash outflows   $ 6.0   $ 8.2
Nominal discount rate, percentage   3.76%   0.90%
Reclamation disbursements amount   $ 3.0 $ 2.0  
Rehabilitation expenses       $ 5.4
Uncollateralized surety bond   7.9   3.0
Reclamation Liabilities [Member]        
Provision for Reclamation Liabilities (Details) [Line Items]        
Deposit with financial institution pledged as security   $ 20.6   $ 15.2
Non adjusting Events [Member] | KSM [Member]        
Provision for Reclamation Liabilities (Details) [Line Items]        
Security deposit $ 5.4