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Share-based compensation - Stock Option and SAR Rollforward (Details)
9 Months Ended
Sep. 28, 2024
$ / shares
shares
Number of options  
Beginning balance (in shares) | shares 9,726,970
Granted (in shares) | shares 22,100
Forfeited (in shares) | shares (3,535)
Expired (in shares) | shares (331,996)
Exercised (in shares) | shares (1,063,558)
Ending balance (in shares) | shares 8,349,981
Weighted average exercise price  
Beginning balance (in usd per share) | $ / shares $ 10.90
Granted (in usd per share) | $ / shares 14.87
Forfeited (in usd per share) | $ / shares 13.50
Expired (in usd per share) | $ / shares 17.26
Exercised (in usd per share) | $ / shares 10.73
Ending balance (in usd per share) | $ / shares $ 10.68
—Share options  
Number of options  
Beginning balance (in shares) | shares 2,345,520
Expired (in shares) | shares (331,730)
Exercised (in shares) | shares (408,422)
Ending balance (in shares) | shares 1,605,368
Weighted average exercise price  
Beginning balance (in usd per share) | $ / shares $ 14.90
Expired (in usd per share) | $ / shares 17.27
Exercised (in usd per share) | $ / shares 14.17
Ending balance (in usd per share) | $ / shares $ 14.60
Exercisable at the end of the period (in shares) | shares 8,269,839
Exercisable at the end of the period (in usd per share) | $ / shares $ 10.64
Vested and expected to vest at the end of the period (in shares) | shares 8,349,643
Vested and expected to vest at the end of the period (in usd per share) | $ / shares $ 10.68
—SARs  
Number of options  
Beginning balance (in shares) | shares 735,221
Granted (in shares) | shares 22,100
Forfeited (in shares) | shares (3,535)
Expired (in shares) | shares (266)
Exercised (in shares) | shares (148,438)
Ending balance (in shares) | shares 605,082
Weighted average exercise price  
Beginning balance (in usd per share) | $ / shares $ 10.47
Granted (in usd per share) | $ / shares 14.87
Forfeited (in usd per share) | $ / shares 13.50
Expired (in usd per share) | $ / shares 14.04
Exercised (in usd per share) | $ / shares 9.68
Ending balance (in usd per share) | $ / shares $ 10.81
—Premium-priced options  
Number of options  
Beginning balance (in shares) | shares 835,469
Ending balance (in shares) | shares 835,469
Weighted average exercise price  
Beginning balance (in usd per share) | $ / shares $ 18.88
Ending balance (in usd per share) | $ / shares $ 18.88
—Tier I | —Share options  
Number of options  
Beginning balance (in shares) | shares 1,828,327
Exercised (in shares) | shares (133,758)
Ending balance (in shares) | shares 1,694,569
Weighted average exercise price  
Beginning balance (in usd per share) | $ / shares $ 6.98
Exercised (in usd per share) | $ / shares 6.81
Ending balance (in usd per share) | $ / shares $ 6.99
—Tier II | —Share options  
Number of options  
Beginning balance (in shares) | shares 1,996,017
Exercised (in shares) | shares (177,264)
Ending balance (in shares) | shares 1,818,753
Weighted average exercise price  
Beginning balance (in usd per share) | $ / shares $ 7.01
Exercised (in usd per share) | $ / shares 6.87
Ending balance (in usd per share) | $ / shares $ 7.02
—Tier IV | —Share options  
Number of options  
Beginning balance (in shares) | shares 1,986,416
Exercised (in shares) | shares (195,676)
Ending balance (in shares) | shares 1,790,740
Weighted average exercise price  
Beginning balance (in usd per share) | $ / shares $ 10.52
Exercised (in usd per share) | $ / shares 10.51
Ending balance (in usd per share) | $ / shares $ 10.52