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Segment Results (Schedule Of Net Sales to External Customers) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net sales to external customers $ 425.2 $ 386.6 $ 1,232.5 $ 1,078.0
Cost of goods sold 246.7 222.5 728.3 640.3
Gross profit (loss) 178.5 164.1 504.2 437.7
Selling, general and administrative expenses 90.1 77.6 252.1 223.1
Loss related to change in fair value of contingent consideration 0.1 0.2 0.5 0.6
Loss (gain) on sales and impairment of fixed assets, net (0.9) 0.2 (0.8) 0.3
Equity (earnings) from unconsolidated affiliates, net (28.0) (25.2) (86.5) (78.7)
Operating income 117.2 111.3 338.9 292.4
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 425.2 386.6 1,232.5 1,078.0
Cost of goods sold 246.7 222.5 728.3 640.3
Gross profit (loss) 178.5 164.1 504.2 437.7
Selling, general and administrative expenses 90.1 77.6 252.1 223.1
Loss related to change in fair value of contingent consideration 0.1 0.2 0.5 0.6
(Gain) on sales of fixed assets, net (0.9)   (0.8)  
Loss (gain) on sales and impairment of fixed assets, net   0.2   0.3
Equity (earnings) from unconsolidated affiliates, net (28.0) (25.2) (86.5) (78.7)
Operating income 117.2 111.3 338.9 292.4
Depreciation and amortization 30.1 26.1 89.9 75.9
Purchases of property, plant and equipment 22.6 19.4 61.6 54.0
Mineral Fiber [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 274.0 258.0 786.1 747.8
Mineral Fiber [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 274.0 258.0 786.1 747.8
Cost of goods sold 155.3 146.5 460.0 439.7
Gross profit (loss) 118.7 111.5 326.1 308.1
Selling, general and administrative expenses 49.1 43.6 132.3 132.8
Loss related to change in fair value of contingent consideration 0.0 0.1 0.2 0.5
(Gain) on sales of fixed assets, net (0.9)   (0.9)  
Loss (gain) on sales and impairment of fixed assets, net   0.3   0.3
Equity (earnings) from unconsolidated affiliates, net (28.2) (25.5) (87.1) (79.4)
Operating income 98.7 93.0 281.6 253.9
Depreciation and amortization 21.6 19.7 64.5 59.3
Purchases of property, plant and equipment 18.5 15.9 49.9 43.5
Architectural Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 151.2 128.6 446.4 330.2
Architectural Specialties [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 151.2 128.6 446.4 330.2
Cost of goods sold 91.1 75.5 267.3 199.4
Gross profit (loss) 60.1 53.1 179.1 130.8
Selling, general and administrative expenses 40.7 33.9 119.0 89.6
Loss related to change in fair value of contingent consideration 0.1 0.1 0.3 0.1
(Gain) on sales of fixed assets, net 0.0   0.1  
Loss (gain) on sales and impairment of fixed assets, net   (0.1)   0.0
Equity (earnings) from unconsolidated affiliates, net 0.0 0.0 0.0 0.0
Operating income 19.3 19.2 59.7 41.1
Depreciation and amortization 8.5 6.4 25.4 16.6
Purchases of property, plant and equipment 4.1 3.5 11.7 10.5
Unallocated Corporate [Member] | Unallocated Corporate [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 0.0 0.0 0.0 0.0
Cost of goods sold 0.3 0.5 1.0 1.2
Gross profit (loss) (0.3) (0.5) (1.0) (1.2)
Selling, general and administrative expenses 0.3 0.1 0.8 0.7
Loss related to change in fair value of contingent consideration 0.0 0.0 0.0 0.0
(Gain) on sales of fixed assets, net 0.0   0.0  
Loss (gain) on sales and impairment of fixed assets, net   0.0   0.0
Equity (earnings) from unconsolidated affiliates, net 0.2 0.3 0.6 0.7
Operating income (0.8) (0.9) (2.4) (2.6)
Depreciation and amortization 0.0 0.0 0.0 0.0
Purchases of property, plant and equipment $ 0.0 $ 0.0 $ 0.0 $ 0.0