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Nature of Operations (Schedule Of Sales Allocated To Geographic Area) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 1,620.8	$ 1,445.7	$ 1,295.2
Mineral Fiber [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	1,030.7	986.0	932.4
Mineral Fiber [Member] | United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	954.0	909.5	854.2
Mineral Fiber [Member] | Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	76.7	76.5	78.2
Architectural Specialties [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	590.1	459.7	362.8
Architectural Specialties [Member] | United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	577.6	448.8	349.3
Architectural Specialties [Member] | Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 12.5	$ 10.9	$ 13.5

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