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Significant accounting policies - IFRS 16 (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
IFRS 16 Financial Instruments    
Right-of-use assets $ 2.7  
Adjustment    
IFRS 16 Financial Instruments    
Right-of-use assets   $ 2.8
Weighted average incremental borrowing rate (as a percent)   4.55%