Nature of Operations (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Dec. 31, 2024 |
Sep. 30, 2024 |
Dec. 31, 2024 |
|
| Segment Reporting Information [Line Items] | |||
| Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] | President and Chief Executive Officer [Member] | ||
| Architectural Specialties [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Proceeds from the sale of assets | $ 2.1 | ||
| Gain on sale of properties | $ 0.0 | ||
| WAVE [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Equity interest percentage | 50.00% | 50.00% | |
| Plant in St.Helens, Oregon [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Proceeds from the sale of assets | $ 9.4 | ||
| Gain on sale of properties | 4.6 | ||
| Land in Lancaster, Pennsylvania [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Proceeds from the sale of assets | $ 12.8 | ||
| Gain on sale of properties | $ 0.3 | ||
| Asset impairment loss | $ 4.9 | ||