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Stock-based compensation - Phantom Units Narratives (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award      
Issuance price (usd per share) $ 3.32    
Phantom Units      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares outstanding (shares)   0 1,202,435
2020 Plan | Phantom Units | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage (percent) 25.00%    
Vesting period (years) 1 year    
Vesting percentage in liquidity event (percent) 100.00%    
2020 Plan | Phantom Units | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (years) 3 years    
2020 Plan | SARs      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (years) 4 years    
Shares outstanding (shares) 394,736    
Intrinsic value, shares outstanding $ 1.3