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Stock award plan - Restricted Stock (Details) - Unvested restricted stock units
 9 Months Ended
Sep. 30, 2025
$ / shares
shares
Number of Shares  
Balance at the beginning of the period (in shares) | shares 3,527,575
Granted (in shares) | shares 1,615,305
PSUs with conditions satisfied (in shares) | shares 75,000
Vested (in shares) | shares (1,201,681)
Forfeited (in shares) | shares (227,396)
Balance at the end of the period (in shares) | shares 3,788,803
Weighted Average Grant Date Fair Value  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 33.39
Granted (in dollars per share) | $ / shares 47.16
PSUs with conditions satisfied (in dollars per share) | $ / shares 28.58
Vested (in dollars per share) | $ / shares 36.79
Forfeited (in dollars per share) | $ / shares 35.27
Balance at the end of the period (in dollars per share) | $ / shares $ 37.98