Segment Results (Reconciliation Of Total Segment Assets To Total Consolidated Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,573.8	$ 2,606.2
Building Products [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,069.1	1,079.7
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	510.4	492.7
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	342.5	329.8
Unallocated Corporate Segment [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 651.8	$ 704.0