Acquisitions and Discontinued Operations (Summary of Total Depreciation and Amortization and Capital Expenditures) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Depreciation and amortization	$ 22.2	$ 34.4	$ 61.7
Fixed asset impairment	74.0
Purchases of property, plant and equipment	(12.0)	(37.9)	(96.2)
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Depreciation and amortization	22.2	23.0	22.6
Fixed asset impairment	74.0
Purchases of property, plant and equipment	$ (12.0)	(25.8)	(34.6)
Flooring Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Depreciation and amortization		11.4	39.1
Purchases of property, plant and equipment		$ (12.1)	$ (61.6)