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Segment Information - Schedule of Segment Assets (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |
Segment assets | $ 2,758.4 | $ 2,725.6
Composite Materials |  |
Segment Reporting Information [Line Items] |  |
Segment assets | 2,318.6 | 2,147.6
Engineered Products |  |
Segment Reporting Information [Line Items] |  |
Segment assets | 588.4 | 541.4
Corporate & Other and Intersegment Elimination |  |
Segment Reporting Information [Line Items] |  |
Segment assets | $ (148.6) | $ 36.6

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