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Share based compensation - JSOP 2016 and SOP 2019 narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Options
item
shares
Dec. 31, 2021
€ / shares
shares
Dec. 31, 2020
USD ($)
JSOP 2016      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Stock options exercised | Options 489,586    
Outstanding vested options | shares 571,688 571,688  
Total share-based payment expense recognized | $ $ 0.6   $ 4.0
SOP 2019      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Total share-based payment expense recognized | $ $ 3.6   $ 0.1
Number of shares per option | shares 1    
Exercise price, share options granted | € / shares   € 1.00  
Options waiting period 4 years    
Options exercise period 7 years    
Option forfeiture period 6 months    
SOP 2019 | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Minimum growth to exercise options (as a percent) 10.00%    
Number of tranches | item 1    
Vesting period 4 years   3 years
SOP 2019 | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period     4 years
Termination forfeiture period 4 years