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Derivative financial instruments - Gains From Derivative Instruments Not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Derivative Instruments, Gain (Loss)        
Gain on derivative, recognized in the income statement $ (0.3) $ 1.1 $ 1.1 $ 3.2
—Currency forward contracts recognized in SG&A        
Derivative Instruments, Gain (Loss)        
Gain on derivative, recognized in the income statement $ (0.3) $ 1.1 $ 1.1 $ 3.2