Goodwill and Other Intangible Assets, net - Intangible Assets by Segments (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Other intangibles, net	$ 279.1	$ 278.8
Performance Materials
Finite-Lived Intangible Assets [Line Items]
Other intangibles, net	1.1	1.2
Performance Chemicals
Finite-Lived Intangible Assets [Line Items]
Other intangibles, net	97.0	102.5
Advanced Polymer Technologies segment
Finite-Lived Intangible Assets [Line Items]
Other intangibles, net	$ 181.0	$ 175.1