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Segment Results (Reconciliation of Total Segment Assets to Total Consolidated Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Segment assets	$ 1,893.4	$ 1,842.7
Investments in unconsolidated affiliates	31.3	27.2
Mineral Fiber [Member]
Segment Reporting Information [Line Items]
Segment assets	1,082.1	1,063.8
Investments in unconsolidated affiliates	27.3	22.6
Architectural Specialties [Member]
Segment Reporting Information [Line Items]
Segment assets	621.1	602.2
Investments in unconsolidated affiliates	0.0	0.0
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Segment assets	190.2	176.7
Investments in unconsolidated affiliates	$ 4.0	$ 4.6

X

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