Discontinued Operations (Schedule of Business Details and Line Items Comprising Discontinued Operations on Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
(Loss) gain from disposal of discontinued businesses, before income tax		$ (27.3)	$ (4.4)	$ (31.9)
Income tax (benefit)		(5.0)	(1.4)	(4.9)
(Loss) gain from disposal of discontinued businesses, net of tax	$ (0.2)	(22.3)	(3.0)	(27.0)
Net (loss) from discontinued operations	(0.2)	(17.5)	(3.0)	(24.0)
Net sales		115.5		319.1
Cost of goods sold		86.8		245.7
Gross profit		28.7		73.4
Selling, general and administrative expenses		20.4		61.6
Operating income		8.3		11.8
Other non-operating expense, net		1.0		1.6
Earnings from discontinued operations before income tax		7.3		10.2
Income tax expense		2.5		7.2
Net earnings from discontinued operations, net of tax		4.8		3.0
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
(Loss) gain from disposal of discontinued businesses, before income tax	(0.2)	(27.3)	(5.2)	(31.9)
Income tax (benefit)			(1.4)
(Loss) gain from disposal of discontinued businesses, net of tax	(0.2)	(27.3)	(3.8)	(31.9)
Net (loss) from discontinued operations	$ (0.2)	(22.5)	(3.8)	(28.9)
Net sales		115.5		319.1
Cost of goods sold		86.8		245.7
Gross profit		28.7		73.4
Selling, general and administrative expenses		20.4		61.6
Operating income		8.3		11.8
Other non-operating expense, net		1.0		1.6
Earnings from discontinued operations before income tax		7.3		10.2
Income tax expense		2.5		7.2
Net earnings from discontinued operations, net of tax		4.8		3.0
Flooring Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
(Loss) gain from disposal of discontinued businesses, before income tax			0.8
Income tax (benefit)		(5.0)		(4.9)
(Loss) gain from disposal of discontinued businesses, net of tax		5.0	0.8	4.9
Net (loss) from discontinued operations		$ 5.0	$ 0.8	$ 4.9