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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%