Acquisition and Discontinued Operations (Schedule of Business Details and Line Items Comprising Income From Discontinued Operations on Statements of Earnings and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	$ 104.4	$ 95.6
Cost of goods sold	77.8	79.7
Gross profit	26.6	15.9
Selling, general and administrative expenses	22.0	18.1
Operating income (loss)	4.6	(2.2)
Interest expense	0.4	0.3
Other non-operating (income), net	(1.2)	(0.6)
Earnings (loss) from discontinued operations before income tax	5.4	(1.9)
Income tax expense	1.5	2.8
Net earnings (loss) from discontinued operations, net of tax	3.9	(4.7)
Loss on disposal of discontinued businesses before income tax	(17.7)	(0.1)
Income tax expense (benefit)	(0.4)	0.3
Loss on disposal of discontinued businesses, net of tax	(17.3)	(0.4)
Net (loss) from discontinued operations	(13.4)	(5.1)
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	104.4	95.6
Cost of goods sold	77.8	79.7
Gross profit	26.6	15.9
Selling, general and administrative expenses	22.0	18.1
Operating income (loss)	4.6	(2.2)
Interest expense	0.4	0.3
Other non-operating (income), net	(1.2)	(0.6)
Earnings (loss) from discontinued operations before income tax	5.4	(1.9)
Income tax expense	1.5	2.8
Net earnings (loss) from discontinued operations, net of tax	3.9	(4.7)
Loss on disposal of discontinued businesses before income tax	(17.7)
Loss on disposal of discontinued businesses, net of tax	(17.7)
Net (loss) from discontinued operations	(13.8)	(4.7)
Flooring Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on disposal of discontinued businesses before income tax		(0.1)
Income tax expense (benefit)	(0.4)	0.3
Loss on disposal of discontinued businesses, net of tax	0.4	(0.4)
Net (loss) from discontinued operations	$ 0.4	$ (0.4)