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Royalty, stream and other interests (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2020
Sep. 30, 2019
CAD ($)
Ounce
Sep. 30, 2019
USD ($)
Ounce
Mar. 31, 2019
CAD ($)
Dec. 31, 2019
CAD ($)
Ounce
Dec. 31, 2019
USD ($)
Ounce
Dec. 31, 2018
CAD ($)
Ounce
Dec. 31, 2018
USD ($)
Ounce
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Other assets impaired                    
Royalty, Stream And Other Interests [Line Items]                    
Additional impairment charges on royalty and offtake interests             $ 9.7      
Additional impairment charges on royalty and offtake interests, net of income taxes             $ 8.3      
Falco [Member] | Home 5 [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Silver stream percentage             100.00% 100.00%    
Outstanding notes receivable amount             $ 20.0      
Investments in royalty, payment         $ 5.0          
Payment of up-front cash deposit             $ 180.0      
Ongoing payments equal to a percentage of silver spot price             20.00% 20.00%    
Per ounce/carat price             a maximum of US$6 per ounce a maximum of US$6 per ounce    
Falco [Member] | Home 5 [Member] | Short Term Investment [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Investments in royalty, payment         $ 10.0          
Falco [Member] | Home 5 [Member] | Royalty, Stream And Other Interests [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Initial net smelter return         1.00% 1.00%        
Investments in royalty, payment         $ 10.0          
Barkerville [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Net smelter return         4.00% 4.00%        
Barkerville [Member] | Cariboo Gold project [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Net smelter return, additional             1.75% 1.75%    
Cash purchase price             $ 20.0      
Barkerville [Member] | Cariboo Gold project [Member] | Increase [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Net smelter return             4.00% 4.00%    
Victoria [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Investments in associates, royalty streams and other interests             $ 148.0      
Equity interests in associate             $ 50.0      
Victoria [Member] | Dublin Gulch Property [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Percentage of NSR acquired             5.00% 5.00%    
Investments in royalty streams and other interests.             $ 98.0      
Investments in royalty, payment         $ 19.6   $ 78.4      
Refined gold delivered in ounces | Ounce             97,500 97,500    
Net smelter return, additional             3.00% 3.00%    
Victoria [Member] | Dublin Gulch Property [Member] | Financing Transaction Payment Tranche One [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Investments in royalty, payment             $ 49.0      
Victoria [Member] | Dublin Gulch Property [Member] | Financing Transaction Payment Tranche Two [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Investments in royalty, payment             49.0      
Victoria [Member] | Dublin Gulch Property [Member] | Financing Transaction Payment Tranche Two Additional Payments [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Investments in royalty, payment             $ 14.7      
Stornoway Diamond Corporation [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Proportion of ownership interest         35.10% 35.10%        
Diamond stream percentage         9.60% 9.60%        
Proceeds from stream deliveries         $ 6.3          
Working capital facility initial amount         20.0          
Osisko's attributable portion of the working capital facility         7.0          
Osisko's attributable portion of the working capital facility advanced         2.5          
Stornoway Diamond Corporation [Member] | Renard diamond mine [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Impairment of royalty, stream and other interests recorded by the operator         83.2          
Impairment of royalty, stream and other interests       $ 38.9            
Impairment of royalty, stream and other interests, net of tax       28.6            
Stornoway Diamond Corporation [Member] | Renard Diamond Stream [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Proportion of ownership interest             9.60% 9.60%    
Impairment of royalty, stream and other interests         47.2          
Impairment of royalty, stream and other interests, net of tax         34.6          
Additional impairment of royalty stream and other interests         7.0          
Additional impairment of royalty stream and other interests net of tax         5.1          
Estimated recoverable amount       $ 122.4 $ 70.2          
Reasonable increase decrease in estimates, percentage         10.00%       10.00%  
Additional up-front deposit             $ 21.4      
Per ounce/carat price             US$40 per carat US$40 per carat    
Per ounce/carat price before amendment             US$50 per carat US$50 per carat    
Management estimated additional impairment charge         $ 3.0          
Management estimated additional impairment charge net of income taxes         2.2          
Stornoway Diamond Corporation [Member] | Renard Diamond Stream [Member] | Streamers [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Proportion of ownership interest             20.00% 20.00%    
Additional up-front deposit             $ 45.0      
Eleonore NSR royalty [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Impairment of royalty, stream and other interests         27.2   148.5      
Impairment of royalty, stream and other interests, net of tax         20.0   109.1      
Additional impairment of royalty stream and other interests             13.9      
Estimated recoverable amount         $ 101.3   $ 138.6      
Reasonable increase decrease in estimates, percentage             10.00%     10.00%
Reduction to gold mineral reserves and resources due to change in resource estimates             21.00%     21.00%
Long term annual gold production for royalty | Ounce         355,000 355,000 400,000 400,000    
Long term gold price per ounce           $ 1,400   $ 1,300    
Percentage of post tax real discount rate         4.10% 4.10% 5.10% 5.10%    
Management estimated additional impairment charge             $ 7.8      
Additional impairment charges on royalty and offtake interests         $ 10.1          
Additional impairment charges on royalty and offtake interests, net of income taxes         $ 4.2          
Management's estimate long term gold price per ounce           $ 1,260   $ 1,170    
Management's estimate percentage of post tax real discount rate         5.10% 5.10% 6.10% 6.10%    
Eleonore NSR royalty [Member] | Increase [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Percentage of post tax real discount rate         1.00% 1.00%        
Eleonore NSR royalty [Member] | Decrease [Member] | Events after reporting period                    
Royalty, Stream And Other Interests [Line Items]                    
Gold and silver stream percentage decrease in reserves and resources 50.00%                  
Mantos Copper Sa Member | Mantos Blancos copper mine [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Silver stream percentage   100.00% 100.00%       100.00% 100.00%    
Tail stream   40.00% 40.00%       30.00% 30.00%    
Transfer price payment per ounces   8.00% 8.00%       25.00% 25.00%    
Refined silver delivered | Ounce   19,300,000 19,300,000              
Additional investments in royalty, stream and other interests         $ 33.4       $ 25,000,000  
Silver stream buy back percentage             50.00% 50.00%    
Lydian International Limited [Member] | Amulsar Stream And Offtake [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Impairment of royalty, stream and other interests   $ 13.1 $ 9,900,000   66.7 $ 51,300,000 $ 4.7 $ 3,600,000    
Additional impairment of royalty stream and other interests             $ 2.6 $ 2,000,000    
Estimated recoverable amount   $ 97.0 73,700,000   $ 29.0 22,300,000        
Reasonable increase decrease in estimates, percentage             10.00%     10.00%
Long term gold price per ounce     1,350     1,400        
Long term silver price per ounce     $ 17.75     $ 17.50        
Percentage of post tax real discount rate   6.10% 6.10%   10.10% 10.10% 1.00% 1.00%    
Management estimated additional impairment charge             $ 5.8 $ 4,500,000    
Additional impairment charges on royalty and offtake interests, net of income taxes             2.1 1,600,000    
Osisko Bermuda Limited [Member] | Pretium Resources Inc [Member] | Brucejack gold and silver mine [Member]                    
Royalty, Stream And Other Interests [Line Items]                    
Repurchase option amount               118,500,000    
Proceeds from disposal of royalty, stream and other interests   $ 41.3 $ 31,200,000   $ 13.4 $ 10,100,000 $ 159.4 $ 118,500,000    
Proportion of ownership interest             100.00% 100.00%    
Gains on disposals of investment properties   7.6 5,800,000       $ 9.1 $ 6,800,000    
Book value             150.3     $ 111,700,000
Total Impairment             159.0      
Impairment loss recognised in profit or loss, investment property, net of tax             118.3      
Impairment of royalty, stream and other interests             158.2      
Impairment of royalty, stream and other interests, net of tax             117.5      
Amount receivable write-off             $ 0.8      
Total proceeds   $ 54.7 $ 41,300,000