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v3.25.4

Nature of Operations (Schedule of Net Sales to External Customers) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |
Net sales to external customers | $ 1,620.8 | $ 1,445.7 | $ 1,295.2
Cost of goods sold | 962.1 | 864.1 | 798.2
Gross profit (loss) | 658.7 | 581.6 | 497.0
Selling, general and administrative expenses | 339.5 | 308.5 | 262.5
Loss related to change in fair value of contingent consideration | 1.4 | 1.6 | 0.1
(Gain) loss on sales of fixed assets, net | (0.8) | 0.6 | 0.0
Equity earnings from unconsolidated affiliates, net | (112.3) | (103.4) | (89.3)
Segment operating income (loss) | 430.9 | 374.3 | 323.7
Segment assets | 1,924.7 | 1,842.7 |
Investment in unconsolidated affiliates | 26.6 | 27.2 |
Mineral Fiber [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to external customers | 1,030.7 | 986.0 | 932.4
Architectural Specialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to external customers | 590.1 | 459.7 | 362.8
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Unallocated Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of goods sold | 1.4 | 1.6 | 1.7
Gross profit (loss) | (1.4) | (1.6) | (1.7)
Selling, general and administrative expenses | 1.0 | 1.0 | 1.2
Equity earnings from unconsolidated affiliates, net | 0.9 | 0.9 |
Segment operating income (loss) | (3.3) | (3.5) | (2.9)
Segment assets | 216.4 | 176.7 | 159.4
Investment in unconsolidated affiliates | 3.7 | 4.6 |
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to external customers | 1,620.8 | 1,445.7 | 1,295.2
Cost of goods sold | 962.1 | 864.1 | 798.2
Gross profit (loss) | 658.7 | 581.6 | 497.0
Selling, general and administrative expenses | 339.5 | 308.5 | 262.5
Loss related to change in fair value of contingent consideration | 1.4 | 1.6 | 0.1
(Gain) loss on sales of fixed assets, net | (0.8) | 0.6 |
Equity earnings from unconsolidated affiliates, net | (112.3) | (103.4) | (89.3)
Segment operating income (loss) | 430.9 | 374.3 | 323.7
Segment assets | 1,924.7 | 1,842.7 | 1,672.4
Investment in unconsolidated affiliates | 26.6 | 27.2 | 17.4
Depreciation and amortization | 120.4 | 103.2 | 89.2
Purchases of property, plant and equipment | 109.4 | 82.8 | 83.8
Operating Segments [Member] | Mineral Fiber [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to external customers | 1,030.7 | 986.0 | 932.4
Cost of goods sold | 603.3 | 586.2 | 574.1
Gross profit (loss) | 427.4 | 399.8 | 358.3
Selling, general and administrative expenses | 178.9 | 180.8 | 161.9
Loss related to change in fair value of contingent consideration | 0.6 | 0.2 |
(Gain) loss on sales of fixed assets, net | (0.9) | 0.6 |
Equity earnings from unconsolidated affiliates, net | (113.2) | (104.3) | (89.3)
Segment operating income (loss) | 362.0 | 322.5 | 285.7
Segment assets | 1,095.6 | 1,063.8 | 1,091.9
Investment in unconsolidated affiliates | 22.9 | 22.6 | 17.4
Depreciation and amortization | 86.7 | 80.2 | 75.3
Purchases of property, plant and equipment | 86.9 | 64.3 | 67.2
Operating Segments [Member] | Architectural Specialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales to external customers | 590.1 | 459.7 | 362.8
Cost of goods sold | 357.4 | 276.3 | 222.4
Gross profit (loss) | 232.7 | 183.4 | 140.4
Selling, general and administrative expenses | 159.6 | 126.7 | 99.4
Loss related to change in fair value of contingent consideration | 0.8 | 1.4 | 0.1
(Gain) loss on sales of fixed assets, net | 0.1 |  |
Segment operating income (loss) | 72.2 | 55.3 | 40.9
Segment assets | 612.7 | 602.2 | 421.1
Depreciation and amortization | 33.7 | 23.0 | 13.9
Purchases of property, plant and equipment | $ 22.5 | $ 18.5 | $ 16.6

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