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Business combinations - Narrative (Details) - CorpU - USD ($)
$ in Millions
12 Months Ended
Aug. 24, 2021
Dec. 31, 2021
Business Acquisition [Line Items]    
Business combination, consideration transferred $ 28.6  
Cash consideration paid $ 27.1  
Acquisition costs   $ 0.3
Restricted Stock    
Business Acquisition [Line Items]    
Restricted stock issued for business combination (in shares) 61,300  
Unrecognized compensation costs, period for recognition (in years) 3 years 2 years 7 months 6 days