Segment and Related Information, Sales by Product Category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment and Related Information [Abstract]
Net sales	$ 2,118.5	$ 2,169.9	$ 2,125.5
Household & Personal Care [Member]
Segment and Related Information [Abstract]
Net sales	530.0	517.6	476.2
Specialty Additives [Member]
Segment and Related Information [Abstract]
Net sales	610.2	642.6	648.4
High-Temperature Technologies [Member]
Segment and Related Information [Abstract]
Net sales	713.2	720.9	702.5
Environmental & Infrastructure [Member]
Segment and Related Information [Abstract]
Net sales	$ 265.1	$ 288.8	$ 298.4