Derivative financial instruments - Gains From Derivative Instruments Not Designated As Hedging Instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	12 Months Ended
Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Derivative Instruments, Gain (Loss)
Gains on derivative, recognized in the income statement	$ 5.6	$ 6.3	$ 5.1
—Currency forward contracts recognized in SG&A
Derivative Instruments, Gain (Loss)
Gains on derivative, recognized in the income statement	$ 5.6	$ 6.3	$ 5.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E

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