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Financial instruments - Measurement of fair values (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial assets [Abstract]      
Cash and cash equivalents $ 711,528 $ 591,620 $ 320,278
Short-term investments 391,025 0  
Derivative assets 3,881 40,804  
Accounts receivable 402,350 396,824  
Investments in equity securities [1] 28,916 21,417  
Advances receivable from JV Inkai LLP 124,533 58,820  
Financial assets 1,662,233 1,109,485  
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 224,754 258,405  
Current portion of long-term debt 499,599 0  
Dividends payable 0 39,579  
Derivative liabilities 61,387 23,414  
Long-term debt 996,072 1,494,471  
Financial liabilities 1,781,812 1,815,869  
Net (119,579) (706,384)  
Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 2,201 39,984  
Financial liabilities [Abstract]      
Derivative liabilities 54,866 5,624  
Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 1,680 820  
Financial liabilities [Abstract]      
Derivative liabilities 823 970  
Uranium contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 5,698 16,820  
Fair value through profit or loss [member]      
Financial liabilities [Abstract]      
Financial liabilities 61,387 23,414  
Net (57,506) 17,390  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 54,866 5,624  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial liabilities [Abstract]      
Derivative liabilities 823 970  
Fair value through profit or loss [member] | Uranium contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 5,698 16,820  
Financial liabilities at amortised cost category [Member]      
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 224,754    
Current portion of long-term debt 499,599    
Long-term debt 996,072    
Financial liabilities 1,720,425    
Net (90,989)    
Other financial liabilities [member]      
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities   258,405  
Current portion of long-term debt   0  
Dividends payable   39,579  
Long-term debt   1,494,471  
Financial liabilities   1,792,455  
Net   (1,792,455)  
Fair value through profit or loss [member]      
Financial assets [Abstract]      
Financial assets 3,881 40,804  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 2,201 39,984  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 1,680 820  
Financial assets at amortised cost category [Member]      
Financial assets [Abstract]      
Cash and cash equivalents 711,528    
Short-term investments 391,025    
Accounts receivable 402,350    
Advances receivable from JV Inkai LLP 124,533    
Financial assets 1,629,436    
Investments in equity instruments measured at FVOCI [Member]      
Financial assets [Abstract]      
Investments in equity securities 28,916    
Financial assets 28,916    
Financial liabilities [Abstract]      
Net $ 28,916    
Loans and receivables [member]      
Financial assets [Abstract]      
Cash and cash equivalents   591,620  
Short-term investments   0  
Accounts receivable   396,824  
Advances receivable from JV Inkai LLP   58,820  
Financial assets   1,047,264  
Financial liabilities [Abstract]      
Net   1,047,264  
Available for sale [member]      
Financial assets [Abstract]      
Investments in equity securities   21,417  
Financial assets   21,417  
Financial liabilities [Abstract]      
Net   $ 21,417  
[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 . In 2017, these investments were classified as available-for-sale and measured through OCI under IAS 39 (see note 3 ). There were no dividends recognized on any of these investments during the year.