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Litigation and Related Matters (Narrative) (Details)
$ in Millions
 1 Months Ended 12 Months Ended 60 Months Ended
Sep. 30, 2010
Site
Dec. 31, 2025
USD ($)
Site
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2007
Dec. 31, 2021
USD ($)
Loss Contingencies [Line Items]            
Settlement agreement amount of litigation agreement           $ 53.0
Estimated cost for non-groundwater elements   $ 8.0        
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]   Liabilities, Noncurrent Liabilities, Noncurrent      
Environmental liabilities   $ 4.1 $ 4.6      
Reserves for potential environmental liabilities   $ 0.1 4.5 $ 0.5    
Cost of Sales [Member]            
Loss Contingencies [Line Items]            
Reserves for potential environmental liabilities     2.6      
Selling, General and Administrative Expenses [Member]            
Loss Contingencies [Line Items]            
Reserves for potential environmental liabilities     1.9      
Macon Site [Member]            
Loss Contingencies [Line Items]            
Number of landfills listed as Superfund site | Site   2        
Number of landfills AWI entered into an Administrative Order on Consent for a Removal Action | Site 1          
Submission date of final report to EPA Oct. 31, 2016          
Elizabeth City [Member]            
Loss Contingencies [Line Items]            
Percentage of site costs Navy agreed to pay         33.33%  
Other Long-Term Liabilities [Member]            
Loss Contingencies [Line Items]            
Environmental liabilities   $ 4.1 4.2      
Accounts Payable and Accrued Expenses [Member]            
Loss Contingencies [Line Items]            
Environmental liabilities     $ 0.4