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Financial instruments - Measurement of fair values (Details) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial assets [Abstract]      
Cash and cash equivalents $ 918,382 $ 1,062,431 $ 711,528
Short-term investments 24,985 0  
Derivative assets 45,605 10,504  
Accounts receivable 204,980 328,044  
Investments in equity securities [1] 43,873 24,408  
Financial assets 1,237,825 1,425,387  
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 233,649 181,799  
Lease obligation 7,951 12,869  
Derivative liabilities 4,733 12,524  
Long-term debt 995,541 996,718  
Financial liabilities 1,241,874 1,203,910  
Net (4,049) 221,477  
Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 45,605 8,191  
Financial liabilities [Abstract]      
Derivative liabilities 4,733 12,524  
Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 0 2,313  
Financial liabilities [Abstract]      
Derivative liabilities 0 0  
Fair value through profit or loss [member]      
Financial liabilities [Abstract]      
Financial liabilities 4,733 12,524  
Net 40,872 (2,020)  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 4,733 12,524  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial liabilities [Abstract]      
Derivative liabilities 0 0  
Financial liabilities at amortised cost category [Member]      
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 233,649 181,799  
Lease obligation 7,951 12,869  
Long-term debt 995,541 996,718  
Financial liabilities 1,237,141 1,191,386  
Net (88,794) 199,089  
Fair value through profit or loss [member]      
Financial assets [Abstract]      
Financial assets 45,605 10,504  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 45,605 8,191  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 0 2,313  
Financial assets at amortised cost category [Member]      
Financial assets [Abstract]      
Cash and cash equivalents 918,382 1,062,431  
Short-term investments 24,985 0  
Accounts receivable 204,980 328,044  
Financial assets 1,148,347 1,390,475  
Financial liabilities [Abstract]      
Net (88,794) 199,089  
Investments in equity instruments measured at FVOCI [Member]      
Financial assets [Abstract]      
Investments in equity securities 43,873 24,408  
Financial assets 43,873 24,408  
Financial liabilities [Abstract]      
Net $ 43,873 $ 24,408  
[1]

At January 1, 2018, Cameco designated the investments shown below as equity securities at FVOCI because these equity securities represent investments that the Company intends to hold for the long term for strategic purposes . There were no dividends recognized on any of these investments during the year.