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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Indefinite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 217.8 | $ 203.2
Architectural Specialties [Member] |  |
Indefinite-Lived Intangible Assets [Line Items] |  |
Goodwill | 217.6 | 203.0
Mineral Fiber [Member] |  |
Indefinite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 0.2 | $ 0.2

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