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Intangible assets - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 32.1 $ 32.2 $ 63.5 $ 64.7
Intangible assets, foreign currency translation gain (loss) $ 22.6 $ (10.8) $ 29.8 $ (19.6)