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Significant accounting policies - IFRS 9 (Details)
$ in Millions
Jan. 02, 2018
USD ($)
Amortized cost. | Accounts payable and accrued liabilities  
IFRS 9 Financial Instruments  
Financial liabilities $ 21.5
FVTPL | Receivables from provisional concentrate sales  
IFRS 9 Financial Instruments  
Current financial assets 11.3
FVTPL | Warrants  
IFRS 9 Financial Instruments  
Non-current financial assets 0.8
FVTOCI | Equity investments  
IFRS 9 Financial Instruments  
Non-current financial assets 172.2
Amortized cost | Cash and cash equivalents  
IFRS 9 Financial Instruments  
Current financial assets 511.1
Amortized cost | Receivables  
IFRS 9 Financial Instruments  
Current financial assets 54.6
Amortized cost | Loan receivable  
IFRS 9 Financial Instruments  
Non-current financial assets 30.1
Original (IAS 39) | Amortized cost. | Accounts payable and accrued liabilities  
IFRS 9 Financial Instruments  
Financial liabilities 21.5
Original (IAS 39) | FVTPL | Receivables from provisional concentrate sales  
IFRS 9 Financial Instruments  
Current financial assets 11.3
Original (IAS 39) | FVTPL | Warrants  
IFRS 9 Financial Instruments  
Non-current financial assets 0.8
Original (IAS 39) | Available-for-sale | Cash and cash equivalents  
IFRS 9 Financial Instruments  
Current financial assets 511.1
Original (IAS 39) | Available-for-sale | Equity investments  
IFRS 9 Financial Instruments  
Non-current financial assets 172.2
Original (IAS 39) | Amortized cost | Receivables  
IFRS 9 Financial Instruments  
Current financial assets 54.6
Original (IAS 39) | Amortized cost | Loan receivable  
IFRS 9 Financial Instruments  
Non-current financial assets $ 30.1