Restructuring Actions (Summary Of Restructuring Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2.4	$ 0.2	$ 7.3
Floor Products Europe [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.2
Resilient Flooring [Member] | Floor Products Europe [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.2	0.2	5.3
Resilient Flooring [Member] | North America SG&A [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.2
Building Products [Member] | Beaver Falls Plant [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(0.3)		1.3
Building Products [Member] | North America SG&A [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.1
Unallocated Corporate, Resilient Flooring And Building Products [Member] | North America SG&A [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.5		0.9
Wood Flooring [Member] | Other Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ (0.2)