v3.26.3
Segment Results (Schedule Of Net Sales to External Customers) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting Information [Line Items]        
Net sales to external customers $ 475.8 $ 425.2 $ 1,357.7 $ 1,232.5
Cost of goods sold 285.1 246.7 816.7 728.3
Gross profit 190.7 178.5 541.0 504.2
SG&A expenses 91.3 90.1 273.4 252.1
(Gain) loss related to change in fair value of contingent consideration (0.1) 0.1 0.8 0.5
(Gain) on sales of fixed assets, net 0.0 (0.9) 0.0 (0.8)
Equity (earnings) from unconsolidated affiliates, net (31.7) (28.0) (92.4) (86.5)
Operating income 131.2 117.2 359.2 338.9
Depreciation and amortization 32.2 30.1 92.1 89.9
Purchases of property, plant and equipment 24.7 22.6 66.4 61.6
Mineral Fiber [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 292.1 274.0 837.5 786.1
Cost of goods sold 171.7 155.3 493.8 460.0
Gross profit 120.4 118.7 343.7 326.1
SG&A expenses 46.2 49.1 138.7 132.3
(Gain) loss related to change in fair value of contingent consideration 0.0 0.0 1.0 0.2
(Gain) on sales of fixed assets, net   (0.9)   (0.9)
Equity (earnings) from unconsolidated affiliates, net (31.8) (28.2) (92.8) (87.1)
Operating income 106.0 98.7 296.8 281.6
Depreciation and amortization 22.4 21.6 66.4 64.5
Purchases of property, plant and equipment 18.3 18.5 50.0 49.9
Architectural Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 183.7 151.2 520.2 446.4
Cost of goods sold 113.1 91.1 321.9 267.3
Gross profit 70.6 60.1 198.3 179.1
SG&A expenses 44.9 40.7 134.0 119.0
(Gain) loss related to change in fair value of contingent consideration (0.1) 0.1 (0.2) 0.3
(Gain) on sales of fixed assets, net   0.0   0.1
Equity (earnings) from unconsolidated affiliates, net 0.0 0.0 0.0 0.0
Operating income 25.8 19.3 64.5 59.7
Depreciation and amortization 9.8 8.5 25.7 25.4
Purchases of property, plant and equipment 6.4 4.1 16.4 11.7
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 0.3 1.0 1.0
Gross profit (0.3) (0.3) (1.0) (1.0)
SG&A expenses 0.2 0.3 0.7 0.8
(Gain) 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
Equity (earnings) from unconsolidated affiliates, net 0.1 0.2 0.4 0.6
Operating income (0.6) (0.8) (2.1) (2.4)
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