Revenue from Contracts with Customers - Disaggregation of Revenue by Major Source (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Revenue from Contracts with Customers [Abstract]
Net sales	$ 532.4	$ 524.7	$ 1,553.1	$ 1,600.4
Household & Personal Care [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	129.8	130.9	380.3	396.1
Specialty Additives [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	147.6	149.4	443.1	465.4
High-Temperature Technologies [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	178.9	174.8	526.7	536.8
Environmental & Infrastructure [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	76.1	69.6	203.0	202.1
Consumer & Specialties [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	277.4	280.3	823.4	861.5
Consumer & Specialties [Member] | Household & Personal Care [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	129.8	130.9	380.3	396.1
Consumer & Specialties [Member] | Specialty Additives [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	147.6	149.4	443.1	465.4
Engineered Solutions [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	255.0	244.4	729.7	738.9
Engineered Solutions [Member] | High-Temperature Technologies [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	178.9	174.8	526.7	536.8
Engineered Solutions [Member] | Environmental & Infrastructure [Member]
Revenue from Contracts with Customers [Abstract]
Net sales	$ 76.1	$ 69.6	$ 203.0	$ 202.1