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Segment Information - Schedule of Segment Results from Continuing Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | $ 1,036.4 | $ 1,101.7 |  | $ 3,116.5 | $ 3,327.2 |
Goodwill impairment (Note P) |  | 0.0 | $ 675.3 | 0.0 | 675.3 |
Gain on sale of Aerospace Products Group (Note O) | (86.8) | 0.0 |  | (86.8) | 0.0 |
Segment EBIT | 171.1 | 77.7 |  | 324.4 | (473.6) |
Interest expense net of interest income | (16.7) | (20.0) |  | (53.2) | (60.6) |
Earnings (loss) before income taxes | 154.4 | 57.7 |  | 271.2 | (534.2) |
Chief Executive Officer |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Employee benefits and share-based compensation |  |  |  |  | 3.7 |
Bedding Products |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Goodwill impairment (Note P) |  | 0.0 |  |  | 587.2 | $ 0.7
Specialized Products |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 277.5 | 299.9 |  | 881.7 | 935.4 |
Goodwill impairment (Note P) |  |  |  |  | 43.6 |
Furniture, Flooring & Textile Products |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 356.4 | 356.3 |  | 1,050.2 | 1,060.3 |
Goodwill impairment (Note P) |  |  |  |  | 44.5 |
Trade sales |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 1,044.1 | 1,111.4 |  | 3,138.6 | 3,357.0 |
Depreciation and amortization | 25.5 | 31.2 |  | 79.9 | 91.3 |
Nonoperating assets depreciation and amortization | 3.9 | 5.2 |  | 10.8 | 10.6 |
Total depreciation and amortization | 29.4 | 36.4 |  | 90.7 | 101.9 |
Goodwill impairment (Note P) |  |  |  |  | 675.3 |
Restructuring, restructuring-related, and impairment charges (Note E and Note F) | 4.1 | 12.3 |  | 14.6 | 34.3 |
Gain on sale of real estate | (2.5) | (14.0) |  | (24.1) | (26.6) |
Gain from net insurance proceeds | (13.1) |  |  | (13.1) | (2.2) |
Other segment items | 941.7 | 999.0 |  | 2,832.9 | 3,044.3 |
Segment EBIT | 171.3 | 77.7 |  | 324.4 | (470.0) |
Trade sales | Aerospace Products Group (Note O) |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain on sale of Aerospace Products Group (Note O) | (86.8) |  |  | (86.8) |  |
Trade sales | Reportable Subsegments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 1,036.4 | 1,101.7 |  | 3,116.5 | 3,327.2 |
Trade sales | Intersubsegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 7.7 | 9.7 |  | 22.1 | 29.8 |
Trade sales | Bedding Products |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 407.5 | 451.6 |  | 1,200.0 | 1,350.5 |
Depreciation and amortization | 13.2 | 14.8 |  | 39.5 | 43.7 |
Nonoperating assets depreciation and amortization | 1.5 | 2.1 |  | 4.1 | 4.3 |
Total depreciation and amortization | 14.7 | 16.9 |  | 43.6 | 48.0 |
Goodwill impairment (Note P) |  |  |  |  | 587.2 |
Restructuring, restructuring-related, and impairment charges (Note E and Note F) | 3.1 | 8.0 |  | 8.6 | 27.2 |
Gain on sale of real estate | 0.0 | (14.0) |  | (16.7) | (26.6) |
Gain from net insurance proceeds | (13.1) |  |  | (13.1) | 0.0 |
Other segment items | 366.4 | 415.2 |  | 1,104.4 | 1,265.3 |
Segment EBIT | 36.4 | 25.5 |  | 73.2 | (550.6) |
Trade sales | Bedding Products | Aerospace Products Group (Note O) |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain on sale of Aerospace Products Group (Note O) | 0.0 |  |  | 0.0 |  |
Trade sales | Bedding Products | Reportable Subsegments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 402.5 | 445.5 |  | 1,184.6 | 1,331.5 |
Trade sales | Bedding Products | Intersubsegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 5.0 | 6.1 |  | 15.4 | 19.0 |
Trade sales | Specialized Products |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 278.1 | 301.4 |  | 882.6 | 938.6 |
Depreciation and amortization | 7.9 | 11.0 |  | 26.5 | 31.4 |
Nonoperating assets depreciation and amortization | 1.0 | 1.4 |  | 3.0 | 2.9 |
Total depreciation and amortization | 8.9 | 12.4 |  | 29.5 | 34.3 |
Goodwill impairment (Note P) |  |  |  |  | 43.6 |
Restructuring, restructuring-related, and impairment charges (Note E and Note F) | 0.9 | 3.8 |  | 4.9 | 5.1 |
Gain on sale of real estate | 0.0 | 0.0 |  | (1.7) | 0.0 |
Gain from net insurance proceeds | 0.0 |  |  | 0.0 | 0.0 |
Other segment items | 242.2 | 260.4 |  | 756.7 | 816.6 |
Segment EBIT | 112.9 | 24.8 |  | 180.0 | 39.0 |
Trade sales | Specialized Products | Aerospace Products Group (Note O) |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain on sale of Aerospace Products Group (Note O) | (86.8) |  |  | (86.8) |  |
Trade sales | Specialized Products | Reportable Subsegments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 277.5 | 299.9 |  | 881.7 | 935.4 |
Trade sales | Specialized Products | Intersubsegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 0.6 | 1.5 |  | 0.9 | 3.2 |
Trade sales | Furniture, Flooring & Textile Products |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 358.5 | 358.4 |  | 1,056.0 | 1,067.9 |
Depreciation and amortization | 4.4 | 5.4 |  | 13.9 | 16.2 |
Nonoperating assets depreciation and amortization | 1.4 | 1.7 |  | 3.7 | 3.4 |
Total depreciation and amortization | 5.8 | 7.1 |  | 17.6 | 19.6 |
Goodwill impairment (Note P) |  |  |  |  | 44.5 |
Restructuring, restructuring-related, and impairment charges (Note E and Note F) | 0.1 | 0.5 |  | 1.1 | 2.0 |
Gain on sale of real estate | (2.5) | 0.0 |  | (5.7) | 0.0 |
Gain from net insurance proceeds | 0.0 |  |  | 0.0 | (2.2) |
Other segment items | 333.1 | 323.4 |  | 971.8 | 962.4 |
Segment EBIT | 22.0 | 27.4 |  | 71.2 | 41.6 |
Trade sales | Furniture, Flooring & Textile Products | Aerospace Products Group (Note O) |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain on sale of Aerospace Products Group (Note O) | 0.0 |  |  | 0.0 |  |
Trade sales | Furniture, Flooring & Textile Products | Reportable Subsegments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 356.4 | 356.3 |  | 1,050.2 | 1,060.3 |
Trade sales | Furniture, Flooring & Textile Products | Intersubsegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net trade sales | 2.1 | 2.1 |  | 5.8 | 7.6 |
Intersegment eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment EBIT | $ (0.2) | $ 0.0 |  | $ 0.0 | $ (3.6) |

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