Segment and Related Information, Sales By Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Segment and Related Information [Abstract]
Net sales	$ 528.9	$ 541.2	$ 1,020.7	$ 1,075.7
Household & Personal Care [Member]
Segment and Related Information [Abstract]
Net sales	127.4	126.8	250.5	265.2
Specialty Additives [Member]
Segment and Related Information [Abstract]
Net sales	150.3	157.5	295.5	316.0
High-Temperature Technologies [Member]
Segment and Related Information [Abstract]
Net sales	178.4	184.7	347.8	362.0
Environmental & Infrastructure [Member]
Segment and Related Information [Abstract]
Net sales	$ 72.8	$ 72.2	$ 126.9	$ 132.5