Share capital - Schedule of RSUs and PSUs (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
RSUs/PSUs
Number of RSUs/PSUs
Unvested at beginning of year (in shares)	4,466,151
Granted (in shares)	632,275
Vested (in shares)	(569,248)
Forfeited and cancelled (in shares)	(70,071)
Unvested at end of year (in shares)	4,459,107
Weighted average grant date fair value price
Unvested at beginning of year (in usd per share) | $ / shares	$ 54.06
Granted (in usd per share) | $ / shares	138.37
Vested (in usd per share) | $ / shares	52.63
Forfeited and cancelled (in usd per share) | $ / shares	94.41
Unvested at end of year (in usd per share) | $ / shares	$ 65.56
Aggregate intrinsic value
Unvested at end of year | $	$ 334,790
PSUs
Aggregate intrinsic value
Number of PSUs (in shares)	3,029,835
Total fair value at grant date | $	$ 161,885
PSUs | Tranche One
Aggregate intrinsic value
Number of PSUs (in shares)	2,703,852
Fair value at grant date per PSU (in usd per share) | $ / shares	$ 48.16
Total fair value at grant date | $	$ 130,218
PSUs | Tranche Two
Aggregate intrinsic value
Number of PSUs (in shares)	108,113
Fair value at grant date per PSU (in usd per share) | $ / shares	$ 69.37
Total fair value at grant date | $	$ 7,500
PSUs | Tranche Three
Aggregate intrinsic value
Number of PSUs (in shares)	17,712
Fair value at grant date per PSU (in usd per share) | $ / shares	$ 84.68
Total fair value at grant date | $	$ 1,500
PSUs | Tranche Four
Aggregate intrinsic value
Number of PSUs (in shares)	10,532
Fair value at grant date per PSU (in usd per share) | $ / shares	$ 94.94
Total fair value at grant date | $	$ 1,000
PSUs | Tranche Five
Aggregate intrinsic value
Number of PSUs (in shares)	189,626
Fair value at grant date per PSU (in usd per share) | $ / shares	$ 114.26
Total fair value at grant date | $	$ 21,667