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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%