Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net loss due to change in carrying value of discontinued operations net assets			$ (2.1)	$ (15.0)	$ (26.0)
Net loss due to change in carrying value of discontinued operations net assets			(0.4)	(16.4)	(31.2)
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net loss due to change in carrying value of discontinued operations net assets			(2.1)	(15.8)	(31.2)
Net loss due to change in carrying value of discontinued operations net assets			$ (0.4)	(17.2)	$ (31.2)
Valuation loss on pension liabilities		$ 11.8		11.4
European Resilient Flooring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain related to accumulated other comprehensive income adjustment from discontinued foreign entity	[1]			$ 0.8

[1] Represents AOCI adjustments related to accumulated foreign currency translation amounts.