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Significant accounting policies - Other (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jan. 02, 2018
USD ($)
Jan. 01, 2018
USD ($)
item
Significant accounting policies        
Ifrs Cumulative Effect Of New Accounting Principle In Period Of Adoption     $ 27,100,000  
Number of equity investments accounted for at cost | item       1
Carrying value       $ 4,000,000
Number of loan receivable carried at amortized cost | item       1
Loan receivable at amortized cost       $ 30,100,000
Impairment loss recognized $ 0 $ 0