Segment Results (Reconciliation Of Total Segment Assets To Total Consolidated Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,991.5	$ 2,916.6
Building Products [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,087.3	1,071.9
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	680.2	635.2
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	354.6	335.2
Unallocated Corporate Segment [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 869.4	$ 874.3