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Fair value measurement - Carrying Amount and Fair Value of Debt (Details) - USD ($)
$ in Millions
Jun. 28, 2025
Dec. 28, 2024
Carrying  amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Current $ 39.8 $ 39.1
Non-current 2,304.9 2,311.5
Fair value of debt 2,344.7 2,350.6
Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Current 39.6 38.7
Non-current 2,339.1 2,314.3
Fair value of debt $ 2,378.7 $ 2,353.0