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Shareholders' equity - Change in accumulated other comprehensive income, net of tax (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 3,336,457	$ 2,979,320
Other comprehensive (loss) income before reclassifications	(18,560)	(4,551)
Amounts reclassified from accumulated other comprehensive income	3,898	2,128
Net current-period other comprehensive income (loss)	(14,662)	(2,423)
Ending Balance	3,466,102	3,097,402
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(482)	735
Other comprehensive (loss) income before reclassifications	(574)	(4,189)
Amounts reclassified from accumulated other comprehensive income	998	(723)
Net current-period other comprehensive income (loss)	424	(4,912)
Ending Balance	(58)	(4,177)
Pension and Other Postretirement Benefit Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(150,257)	(138,810)
Other comprehensive (loss) income before reclassifications	9	183
Amounts reclassified from accumulated other comprehensive income	2,900	2,851
Net current-period other comprehensive income (loss)	2,909	3,034
Ending Balance	(147,348)	(135,776)
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(146,559)	(206,317)
Other comprehensive (loss) income before reclassifications	(17,995)	(545)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income (loss)	(17,995)	(545)
Ending Balance	(164,554)	(206,862)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(297,298)	(344,392)
Ending Balance	$ (311,960)	$ (346,815)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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