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Fair value measurement - Narratives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024	Apr. 30, 2024
Debt Instrument
—Asset impairments related to restructuring	$ 0.2	$ 0.0	$ 0.8	$ 0.0
Equity investment in a privately held company					$ 5.0
Two Dollar Term Loan | Term loan
Debt Instrument
Variable rate (as a percent)			0.50%

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