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Employee compensation plans - Summarizes of Company's Non-Vested ESP/EIP Awards (Details) - Class A Stock - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of Class A Shares Subject to Restricted Stock  Awards    
Non-vested beginning of year (in shares) 1,328,877  
Granted (in shares) 631,390  
Vested (in shares) (376,139)  
Forfeited or expired (in shares) (41,412)  
Non-vested end of year (in shares) 1,542,716 1,328,877
Weighted Average Fair Value    
Non-vested beginning of year (in dollars per share) $ 22.63  
Granted (in dollars per share) 29.66  
Vested (in dollars per share) 17.79  
Forfeited or expired (in dollars per share) 25.95  
Non-vested end of year (in dollars per share) $ 26.59 $ 22.63
Remaining contractual life, Non-vested 2 years 2 months 12 days 1 year 10 months 24 days
Remaining contractual life, Granted 2 years 10 months 24 days