Armstrong Flooring, Inc. Quarterly report pursuant to Section 13 or 15(d)

Plant Closure Expenses (Details) $ in Millions	3 Months Ended
Plant Closure Expenses (Details) $ in Millions	Mar. 31, 2018 position	Dec. 31, 2017 employee	Sep. 30, 2017	Sep. 30, 2017 manufacturing_facility	Mar. 31, 2017 position	Sep. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of positions eliminated \| position	70				40
Estimated pre-tax charges closure-related expenses \| $						$ 0.4
Wood Flooring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of manufacturing facilities ceasing operations			2	2
Number of positions eliminated \| employee		300