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Financial instruments - Measurement of fair values (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial assets [Abstract]      
Cash and cash equivalents $ 1,062,431 $ 711,528 $ 591,620
Short-term investments 0 391,025  
Derivative assets 10,504 3,881  
Accounts receivable 328,044 402,350  
Investments in equity securities [1] 24,408 28,916  
Advances receivable from JV Inkai LLP 0 124,533  
Financial assets 1,425,387 1,662,233  
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 181,799 224,754  
Lease obligation 12,869 0  
Current portion of long-term debt 0 499,599  
Derivative liabilities 12,524 61,387  
Long-term debt 996,718 996,072  
Financial liabilities 1,203,910 1,781,812  
Net 221,477 (119,579)  
Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 8,191 2,201  
Financial liabilities [Abstract]      
Derivative liabilities 12,524 54,866  
Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 2,313 1,680  
Financial liabilities [Abstract]      
Derivative liabilities 0 823  
Uranium contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 0 5,698  
Fair value through profit or loss [member]      
Financial liabilities [Abstract]      
Financial liabilities 12,524 61,387  
Net (2,020) (57,506)  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 12,524 54,866  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial liabilities [Abstract]      
Derivative liabilities 0 823  
Fair value through profit or loss [member] | Uranium contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 0 5,698  
Financial liabilities at amortised cost category [Member]      
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 181,799 224,754  
Lease obligation 12,869    
Current portion of long-term debt 0 499,599  
Long-term debt 996,718 996,072  
Financial liabilities 1,191,386 1,720,425  
Net 199,089 (90,989)  
Fair value through profit or loss [member]      
Financial assets [Abstract]      
Financial assets 10,504 3,881  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 8,191 2,201  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 2,313 1,680  
Financial assets at amortised cost category [Member]      
Financial assets [Abstract]      
Cash and cash equivalents 1,062,431 711,528  
Short-term investments 0 391,025  
Accounts receivable 328,044 402,350  
Advances receivable from JV Inkai LLP 0 124,533  
Financial assets 1,390,475 1,629,436  
Financial liabilities [Abstract]      
Net 199,089 (90,989)  
Investments in equity instruments measured at FVOCI [Member]      
Financial assets [Abstract]      
Investments in equity securities 24,408 28,916  
Financial assets 24,408 28,916  
Financial liabilities [Abstract]      
Net $ 24,408 $ 28,916  
[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.