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Commitments and contingent liabilities (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2025	Sep. 28, 2025	Sep. 28, 2025
Loss Contingencies [Line Items]
Estimated litigation liability		$ 1.9	$ 1.9
Italian Parliament Legislation
Loss Contingencies [Line Items]
Loss contingency, reduction in percentage	25.00%
Loss contingency period decrease		23.7	23.7
Loss contingency accrual		18.3	18.3
Loss contingency period decrease, for prior periods		20.1	20.1
Palette
Loss Contingencies [Line Items]
Loss contingency accrual		$ 4.4	$ 4.4
Minimum
Loss Contingencies [Line Items]
Estimated time frame over which accrued amounts may be paid out		10 years	10 years
Maximum
Loss Contingencies [Line Items]
Estimated time frame over which accrued amounts may be paid out		15 years	15 years
Accrued liabilities
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 0.5	$ 0.5
Other liability
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 3.0	$ 3.0

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