v3.26.1
Segment Results (Schedule Of Net Sales to External Customers) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting Information [Line Items]        
Net sales to external customers $ 472.0 $ 424.6 $ 881.9 $ 807.3
Cost of goods sold 277.0 248.8 531.6 481.6
Gross profit 195.0 175.8 350.3 325.7
SG&A expenses 93.7 84.4 182.1 162.1
Loss related to change in fair value of contingent consideration, net 0.9 0.1 0.9 0.4
Equity (earnings) from unconsolidated affiliates, net (33.4) (31.9) (60.7) (58.5)
Operating income 133.8 123.2 228.0 221.7
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 472.0 424.6 881.9 807.3
Cost of goods sold 277.0 248.8 531.6 481.6
Gross profit 195.0 175.8 350.3 325.7
SG&A expenses 93.7 84.4 182.1 162.1
Loss related to change in fair value of contingent consideration, net 0.9 0.1 0.9 0.4
Equity (earnings) from unconsolidated affiliates, net (33.4) (31.9) (60.7) (58.5)
Operating income 133.8 123.2 228.0 221.7
Depreciation and amortization 30.2 30.5 59.9 59.8
Purchases of property, plant and equipment 24.0 19.9 41.7 39.0
Mineral Fiber [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 288.2 267.0 545.4 512.1
Mineral Fiber [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 288.2 267.0 545.4 512.1
Cost of goods sold 166.8 156.7 322.1 304.7
Gross profit 121.4 110.3 223.3 207.4
SG&A expenses 48.7 43.8 92.5 83.2
Loss related to change in fair value of contingent consideration, net 1.0 0.2 1.0 0.2
Equity (earnings) from unconsolidated affiliates, net (33.6) (32.1) (61.0) (58.9)
Operating income 105.3 98.4 190.8 182.9
Depreciation and amortization 22.0 22.1 44.0 42.9
Purchases of property, plant and equipment 17.8 16.8 31.7 31.4
Architectural Specialties [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 183.8 157.6 336.5 295.2
Architectural Specialties [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 183.8 157.6 336.5 295.2
Cost of goods sold 109.8 91.8 208.8 176.2
Gross profit 74.0 65.8 127.7 119.0
SG&A expenses 44.7 40.3 89.1 78.4
Loss related to change in fair value of contingent consideration, net (0.1) (0.1) (0.1) 0.2
Equity (earnings) from unconsolidated affiliates, net 0.0 0.0 0.0 0.0
Operating income 29.4 25.6 38.7 40.4
Depreciation and amortization 8.2 8.4 15.9 16.9
Purchases of property, plant and equipment 6.2 3.1 10.0 7.6
Unallocated Corporate [Member] | Unallocated Corporate [Member]        
Segment Reporting Information [Line Items]        
Cost of goods sold 0.4 0.3 0.7 0.7
Gross profit (0.4) (0.3) (0.7) (0.7)
SG&A expenses 0.3 0.3 0.5 0.5
Loss related to change in fair value of contingent consideration, net 0.0 0.0 0.0 0.0
Equity (earnings) from unconsolidated affiliates, net 0.2 0.2 0.3 0.4
Operating income (0.9) (0.8) (1.5) (1.6)
Unallocated Corporate [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales to external customers 0.0 0.0 0.0 0.0
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