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Mining Interests (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2022
CAD ($)
Point
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Point
Disclosure of detailed information about property, plant and equipment [line items]      
Amount of consideration   $ 150.0  
Cash flow projections which had been 10% lower than management's estimates      
Disclosure of detailed information about property, plant and equipment [line items]      
Additional Impairment charge $ 35.0   $ 193.0
Long-term Gold Price per Ounce Applied Cash Flow Projections Ten Percent Lower Than Management Estimates [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Additional Impairment charge   18.2  
Expected Number of contained Ounces of Gold Applied to the Cash Flow Projections Ten Percent Lower Than Management Estimates [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Additional Impairment charge   $ 9.1  
Long-term gold price per ounce applied to the cash flow projections (as a percent)   10.00%  
Cash flow projections which had been 100 basis points higher than management's estimates      
Disclosure of detailed information about property, plant and equipment [line items]      
Additional Impairment charge $ 5.8   $ 55.7
Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Long-term gold price per ounce applied to the cash flow projections (as a percent) 10.00%   10.00%
Minimum | Long-term Gold Price per Ounce Applied Cash Flow Projections Ten Percent Lower Than Management Estimates [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Long-term gold price per ounce applied to the cash flow projections (as a percent)   10.00%  
Cariboo Gold Project      
Disclosure of detailed information about property, plant and equipment [line items]      
Percentage of net smelter return royalty   5.00%  
Impairment charge     $ 59.0
Net estimated recoverable amount     $ 435.7
Pre-tax real discount rate     12.60%
Number of basis points higher than management estimates | Point     100
San Antonio Properties      
Disclosure of detailed information about property, plant and equipment [line items]      
Gold and silver stream (as a percent)   15.00%  
Impairment charge $ 81.0    
Net estimated recoverable amount $ 35.0    
Pre-tax real discount rate 19.90%    
Number of basis points higher than management estimates | Point 100    
Tintic Properties | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Percentage of royalty on all refined metals stream   2.00%  
Tintic Properties | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Percentage of royalty on all refined metals stream   2.50%  
Trixie Test Mining Properties      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment charge   $ 160.5  
Net estimated recoverable amount   $ 51.6  
Pre-tax real discount rate   10.40%