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Litigation and Related Matters (Narrative) (Details)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2010
site
Aug. 31, 2010
site
Jun. 30, 2016
USD ($)
Litigation
site
Dec. 31, 2007
Dec. 31, 2015
USD ($)
Litigation And Related Matters [Line Items]          
Number of active and independent litigation matters for which pursuing coverage and recoveries | Litigation     2    
Potential environmental liabilities | $     $ 3.5   $ 6.0
Recorded amount for probable recoveries | $     $ 0.0   $ 0.0
St Helens Site [Member]          
Litigation And Related Matters [Line Items]          
Number of facilities tested for contamination   2      
Macon Site [Member]          
Litigation And Related Matters [Line Items]          
Number of landfills listed as Superfund site     2    
WWTP Landfill [Member]          
Litigation And Related Matters [Line Items]          
Number of landfills AWI entered into an Administrative Order on Consent for a Removal Action 1        
Elizabeth City [Member]          
Litigation And Related Matters [Line Items]          
Percentage of site costs Navy agreed to pay       33.33%