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Shareholders' equity - Change in accumulated other comprehensive income, net of tax (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Jul. 02, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 4,440,988 $ 4,021,968
Other comprehensive income (loss) before reclassifications (42,946) 23,717
Amounts reclassified from accumulated other comprehensive (loss) income 78,146 (2,059)
Net current-period other comprehensive income (loss) 35,200 21,658
Ending balance 4,558,719 4,215,092
Cash Flow Hedges    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 1,396 4,931
Other comprehensive income (loss) before reclassifications (780) 8,056
Amounts reclassified from accumulated other comprehensive (loss) income (2,095) (4,855)
Net current-period other comprehensive income (loss) (2,875) 3,201
Ending balance (1,479) 8,132
Pension and Other Postretirement Benefit Plans    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (88,049) (135,799)
Other comprehensive income (loss) before reclassifications 8,735 (388)
Amounts reclassified from accumulated other comprehensive (loss) income 80,241 2,796
Net current-period other comprehensive income (loss) 88,976 2,408
Ending balance 927 (133,391)
Foreign Currency Translation Adjustment    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (227,752) (272,654)
Other comprehensive income (loss) before reclassifications (50,901) 16,049
Amounts reclassified from accumulated other comprehensive (loss) income 0 0
Net current-period other comprehensive income (loss) (50,901) 16,049
Ending balance (278,653) (256,605)
Accumulated Other Comprehensive (Loss) Income    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (314,405) (403,522)
Ending balance $ (279,205) $ (381,864)