Discontinued Operations (Schedule of Business Details and Line Items Comprising Discontinued Operations on Statements of Earnings and Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	$ 319.1	$ 446.1	$ 436.2
Cost of goods sold	245.7	341.4	350.8
Gross profit	73.4	104.7	85.4
Selling, general and administrative expenses	61.6	85.8	78.3
Operating income	11.8	18.9	7.1
Interest expense		1.4	1.2
Other non-operating expense (income), net	1.6	(0.3)	(1.9)
Earnings from discontinued operations before income tax	10.2	17.8	7.8
Income tax expense	12.0	8.2	3.6
Net earnings (loss) from discontinued operations, net of tax	(1.8)	9.6	4.2
Loss from disposal of discontinued operations before income tax	(31.2)	(19.3)	(109.3)
(Loss) from disposal of discontinued business, tax (benefit)	(5.2)	(6.0)	(4.1)
(Loss) gain from disposal of discontinued businesses, net of tax	(26.0)	(13.3)	(105.2)
Net (loss) from discontinued operations	(27.8)	(3.7)	(101.0)
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	319.1	446.1	436.2
Cost of goods sold	245.7	341.4	350.8
Gross profit	73.4	104.7	85.4
Selling, general and administrative expenses	61.6	85.8	78.3
Operating income	11.8	18.9	7.1
Interest expense		1.4	1.2
Other non-operating expense (income), net	1.6	(0.3)	(1.9)
Earnings from discontinued operations before income tax	10.2	17.8	7.8
Income tax expense	12.0	8.2	3.6
Net earnings (loss) from discontinued operations, net of tax	(1.8)	9.6	4.2
Loss from disposal of discontinued operations before income tax	(31.2)	(19.3)	(109.2)
(Loss) gain from disposal of discontinued businesses, net of tax	(31.2)	(19.3)	(109.2)
Net (loss) from discontinued operations	(33.0)	(9.7)	(105.0)
Flooring Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss from disposal of discontinued operations before income tax			(0.1)
(Loss) from disposal of discontinued business, tax (benefit)	(5.2)	(6.0)	(4.1)
(Loss) gain from disposal of discontinued businesses, net of tax	5.2	6.0	4.0
Net (loss) from discontinued operations	$ 5.2	$ 6.0	$ 4.0