Acquisition and Discontinued Operations (Schedule of Business Details and Line Items Comprising Discontinued Operations on Statements of Earnings and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	$ 114.6	$ 105.2	$ 219.0	$ 200.8
Cost of goods sold	87.3	84.4	165.1	164.1
Gross profit	27.3	20.8	53.9	36.7
Selling, general and administrative expenses	19.7	19.5	41.7	37.6
Operating income (loss)	7.6	1.3	12.2	(0.9)
Interest expense	0.5	0.3	0.9	0.6
Other non-operating (income) expense, net	1.4	(0.5)	0.2	(1.1)
Earnings (loss) from discontinued operations before income tax	5.7	1.5	11.1	(0.4)
Income tax expense	0.2	3.7	1.7	6.5
Net earnings (loss) from discontinued operations, net of tax	5.5	(2.2)	9.4	(6.9)
(Loss) on disposal of discontinued businesses, before income tax	(5.7)		(23.4)	(0.1)
Income tax expense	0.1	0.2	(0.3)	0.5
(Loss) on disposal of discontinued businesses, net of tax	(5.8)	(0.2)	(23.1)	(0.6)
Net (loss) from discontinued operations	(0.3)	(2.4)	(13.7)	(7.5)
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales	114.6	105.2	219.0	200.8
Cost of goods sold	87.3	84.4	165.1	164.1
Gross profit	27.3	20.8	53.9	36.7
Selling, general and administrative expenses	19.7	19.5	41.7	37.6
Operating income (loss)	7.6	1.3	12.2	(0.9)
Interest expense	0.5	0.3	0.9	0.6
Other non-operating (income) expense, net	1.4	(0.5)	0.2	(1.1)
Earnings (loss) from discontinued operations before income tax	5.7	1.5	11.1	(0.4)
Income tax expense	0.2	3.7	1.7	6.5
Net earnings (loss) from discontinued operations, net of tax	5.5	(2.2)	9.4	(6.9)
(Loss) on disposal of discontinued businesses, before income tax	(5.7)		(23.4)
(Loss) on disposal of discontinued businesses, net of tax	(5.7)		(23.4)
Net (loss) from discontinued operations	(0.2)	(2.2)	(14.0)	(6.9)
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	0.1	0.2	(0.3)	0.5
(Loss) on disposal of discontinued businesses, net of tax	(0.1)	(0.2)	0.3	(0.6)
Net (loss) from discontinued operations	$ (0.1)	$ (0.2)	$ 0.3	$ (0.6)