Segment Results (Reconciliation Of Total Segment Assets To Total Consolidated Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,961.8	$ 2,854.3
Building Products [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,032.4	975.1
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	665.6	617.6
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	349.9	326.4
Unallocated Corporate Segment [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 913.9	$ 935.2