Segment Results (Reconciliation Of Total Segment Assets To Total Consolidated Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,885.2	$ 2,994.7
Building Products [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	961.5	935.6
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	627.4	575.9
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	330.4	329.5
Unallocated Corporate (Expense) [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 965.9	$ 1,153.7