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Schedule II | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II | SCHEDU LE II Armstrong World Industries, Inc., and Subsidiaries Valuation and Qualifying Reserves (amounts in millions)
|  | Balance at beginning of year |  |  | Additions charged to earnings |  |  | Deductions |  |  | Balance at end of year |
2023 |  |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses |  | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | (0.4 | ) |  | $ | 0.4 |
Provision for discounts |  |  | 2.1 |  |  |  | 26.4 |  |  |  | (26.4 | ) |  |  | 2.1 |
Provision for warranties |  |  | 0.7 |  |  |  | 5.4 |  |  |  | (5.7 | ) |  |  | 0.4 |
Provision for inventory obsolescence |  |  | 0.3 |  |  |  | - |  |  |  | (0.3 | ) |  |  | - |
2024 |  |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses |  | $ | 0.4 |  |  | $ | 1.8 |  |  | $ | (1.4 | ) |  | $ | 0.8 |
Provision for discounts |  |  | 2.1 |  |  |  | 28.7 |  |  |  | (28.8 | ) |  |  | 2.0 |
Provision for warranties |  |  | 0.4 |  |  |  | 5.8 |  |  |  | (5.5 | ) |  |  | 0.7 |
Provision for inventory obsolescence |  |  | - |  |  |  | 0.7 |  |  |  | (0.4 | ) |  |  | 0.3 |
2025 |  |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses |  | $ | 0.8 |  |  | $ | 1.2 |  |  | $ | (1.0 | ) |  | $ | 1.0 |
Provision for discounts |  |  | 2.0 |  |  |  | 28.5 |  |  |  | (28.2 | ) |  |  | 2.3 |
Provision for warranties |  |  | 0.7 |  |  |  | 4.8 |  |  |  | (4.9 | ) |  |  | 0.6 |
Provision for inventory obsolescence |  |  | 0.3 |  |  |  | - |  |  |  | (0.2 | ) |  |  | 0.1 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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