Segment Results (Schedule Of Segment Operating Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ 52.5	$ 47.0
Building Products [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	57.8	59.3
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	9.4	6.4
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	5.1	0.5
Unallocated Corporate Segment [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ (19.8)	$ (19.2)