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Share-based compensation - Restricted stock units (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	Jul. 21, 2020	Sep. 30, 2020
Fair Value (Per unit)
Unrecognized compensation expense, RSUs		$ 31.1
Restricted stock units
Restricted stock (in units)
Outstanding, beginning balance		36,520
Granted		1,262,308
Forfeited		(7,772)
Outstanding, ending balance		1,291,056
Fair Value (Per unit)
Fair value, units outstanding, beginning		$ 12.60
Fair value, units granted		26.00
Fair value, units forfeited		26.00
Fair value, units outstanding, ending		$ 25.62
Weighted average period over which unrecognized compensation expense would be recognized		3 years 9 months 18 days
Omnibus Incentive Plan 2020 Plan [Member]
Restricted stock (in units)
Granted	1,256,538
Omnibus Incentive Plan 2020 Plan [Member] | Restricted stock units
Fair Value (Per unit)
Vesting period		4 years
Stock Option Plan 2017 Plan [Member] | Restricted stock units
Fair Value (Per unit)
Percentage of RSUs that vest		100.00%

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