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Royalty, stream and other interests (Narrative) (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
$ / ounce
Rate
Dec. 31, 2023
USD ($)
$ / ounce
Rate
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Rate
Dec. 31, 2023
USD ($)
Rate
CSA Silver Stream [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 100.00% 100.00%      
Payment of up-front cash deposit $ 99.4 $ 75,000      
CSA Copper Stream [Member]          
Royalty, Stream And Other Interests [Line Items]          
Payment of up-front cash deposit 99.4 $ 75,000      
Equity of Metals Acquisition Corp $ 53.0       $ 40,000
CSA Copper Stream [Member] | First Threshold Stream [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 3.00% 3.00%      
CSA Copper Stream [Member] | Second Threshold Stream [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 4.875% 4.875%      
CSA Copper Stream [Member] | Remaining life of mine [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 2.25% 2.25%      
Gibraltar Silver Stream [Member]          
Royalty, Stream And Other Interests [Line Items]          
Investments in royalty, payment $ 13.6 $ 10,250      
Percentage of portfolio acquired 12.50%     75.00% 12.50%
Effective stream percentage 87.50% 87.50%      
Costa Fuego Copper-Gold Project [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of copper NSR royalty acquired 1.00% 1.00%      
Percentage of gold NSR royalty acquired 3.00% 3.00%      
Investments in royalty, payment $ 19.9 $ 15,000      
Royalty percentage decrease under buy-down payment option 0.50% 0.50%      
Royalty percentage under buy-down payment option copper 0.50% 0.50%      
Royalty percentage under buy-down payment option gold 2.50% 2.50%      
Costa Fuego Copper-Gold Project [Member] | Second anniversary transaction close [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of payment in up-front price paid before anniversary transaction close 130.00% 130.00%      
Costa Fuego Copper-Gold Project [Member] | Third anniversary transaction close [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of payment in up-front price paid before anniversary transaction close 140.00% 140.00%      
Costa Fuego Copper-Gold Project [Member] | Fourth anniversary transaction close [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of payment in up-front price paid before anniversary transaction close 150.00% 150.00%      
Namdini Gold project [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 1.00% 1.00%      
Investments in royalty, payment $ 48.4 $ 35,000      
Stornoway Diamond Corporation [Member]          
Royalty, Stream And Other Interests [Line Items]          
Impairment of royalty, stream and other interests | $ 15.1        
Impairment of royalty, stream and other interests, net of tax | $ 11.1        
Royalty, stream and other interests | $ 2.0        
Tintic Property [Member]          
Royalty, Stream And Other Interests [Line Items]          
Impairment of royalty, stream and other interests | $ $ 23.5        
Average gold price per ounce | $ / ounce 1,870 1,870      
Discount rate 6.00%       6.00%
Reasonable increase decrease in estimates for sensitivity analysis 10.00%       10.00%
Description of cash payments on-going per-ounce cash payments equal to 25% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal on-going per-ounce cash payments equal to 25% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal      
Tintic Property [Member] | First Threshold Stream [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 2.50% 2.50%      
Tintic Property [Member] | Second Threshold Stream [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 2.00% 2.00%      
Cariboo Property [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 5.00% 5.00%      
San Antonio Property [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired 15.00% 15.00%      
Description of cash payments with on-going per-ounce cash payments equal to 15% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal with on-going per-ounce cash payments equal to 15% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal      
Marimaca Copper Project [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired     1.00% 1.00%  
Investments in royalty, payment     $ 20.3 $ 15,500  
Cascabel Copper Gold Project [Member]          
Royalty, Stream And Other Interests [Line Items]          
Percentage of NSR acquired     0.60% 0.60%  
Investments in royalty, payment     $ 67.2 $ 50,000  
Minimum annual royalty payments | $       $ 4,000