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Stock award plan - Restricted Stock (Details) - Restricted stock awards and units
 9 Months Ended
Sep. 30, 2023
$ / shares
shares
Number of Shares  
Balance at the beginning of the period (in shares) | shares 2,516,336
Granted (in shares) | shares 1,973,973
Vested (in shares) | shares (778,442)
Forfeited (in shares) | shares (297,765)
Balance at the end of the period (in shares) | shares 3,414,102
Weighted Average Grant Date Fair Value  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 45.67
Granted (in dollars per share) | $ / shares 40.00
Vested (in dollars per share) | $ / shares 46.34
Forfeited (in dollars per share) | $ / shares 42.65
Balance at the end of the period (in dollars per share) | $ / shares $ 42.50