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Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 03, 2025	Sep. 27, 2024	Oct. 03, 2025	Sep. 27, 2024
Disaggregation of Revenue [Line Items]
Contract revenue recognized, including revenue from deferred revenue beginning balance	$ 1.0	$ 1.4	$ 3.1	$ 4.3
Ipsen And Takeda Collaborations
Disaggregation of Revenue [Line Items]
Revenues recognized for performance obligations satisfied in previous periods	57.6	$ 60.7	151.3	$ 302.0
Remaining performance obligation	$ 31.1		$ 31.1

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