Goodwill and Other Intangible Assets, net - Intangible Assets by Segments (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Intangible Asset, Finite-Lived [Line Items] | ||
| Other intangibles, net | $ 133.2 | $ 176.1 |
| Performance Materials | ||
| Intangible Asset, Finite-Lived [Line Items] | ||
| Other intangibles, net | 0.0 | 0.0 |
| Performance Chemicals | ||
| Intangible Asset, Finite-Lived [Line Items] | ||
| Other intangibles, net | 0.0 | 8.5 |
| Advanced Polymer Technologies | ||
| Intangible Asset, Finite-Lived [Line Items] | ||
| Other intangibles, net | $ 133.2 | $ 167.6 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount, after accumulated amortization, of finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|