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v3.25.3

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

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