Armstrong Flooring, Inc. Annual report pursuant to Section 13 and 15(d)

Litigation and Related Matters (Details) - USD ($) $ in Millions							1 Months Ended	12 Months Ended
	Jul. 18, 2018	Jun. 14, 2018	May 15, 2017	Jul. 13, 2016	May 16, 2016	Jul. 06, 2015	Jul. 31, 2015	Dec. 31, 2013	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Environmental liabilities									$ 0.0	$ 0.0
Armstrong Kushan, multilayered wood flooring imports from China
Loss Contingencies [Line Items]
Countervailing duties rate								0.98%
Antidumping duties rate						3.31%		0.00%
Armstrong Kushan, Multi-layered Wood Flooring Imports from China, Second Administrative Review
Loss Contingencies [Line Items]
Countervailing duties rate							0.99%
Antidumping duties rate							13.74%
Armstrong Kushan, Multi-layered Wood Flooring Imports from China, Second Administrative Review \| Accounts payable and accrued expenses
Loss Contingencies [Line Items]
Estimated litigation liability									5.0
Armstrong Kushan, Multi-layered Wood Flooring Imports from China, Third Administrative Review
Loss Contingencies [Line Items]
Countervailing duties rate					1.38%
Antidumping duties rate				17.37%
Armstrong Kushan, Multi-layered Wood Flooring Imports from China, Third Administrative Review \| Accounts payable and accrued expenses
Loss Contingencies [Line Items]
Estimated litigation liability									$ 6.2
Armstrong Kushan, Multi-layered Wood Flooring Imports from China, Fourth Administrative Review
Loss Contingencies [Line Items]
Countervailing duties rate		0.85%	1.06%
Antidumping duties rate	0.00%