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Events after reporting period (Details) - QMX - Major ordinary share transactions
$ / shares in Units, $ in Thousands, $ in Thousands
Jan. 21, 2021
CAD ($)
shares
Jan. 21, 2021
USD ($)
$ / shares
shares
Disclosure of associates [line items]    
Number of shares held in associate (in shares) 68,125,000  
Proportion of ownership interest in associate (as a percent) 17.00%  
Consideration transferred per share held (in $Cdn per share) | $ / shares   $ 0.075
Consideration transferred per share held (in shares) 0.01523 0.01523
Consideration transferred $ 132,000 $ 103,676
Cash consideration transferred $ 29,840 $ 23,440