Acquisitions 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		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]
Net sales		$ 436.2		$ 681.6	$ 1,614.9
Cost of goods sold		350.8		569.0	1,318.1
Gross profit		85.4		112.6	296.8
Selling, general and administrative expenses		78.3		120.2	266.4
Operating (loss) income		7.1		(7.6)	30.4
Interest expense		1.2		0.3	0.7
Other non-operating (income) expense, net		(1.9)		2.8	0.4
(Loss) earnings from discontinued operations before income tax		7.8		(10.7)	29.3
Income tax (benefit) expense		3.6		(0.8)	34.6
Gain (Loss) earnings from discontinued operations		4.2		(9.9)	(5.3)
Gain (Loss) on expected disposal of discontinued businesses before income tax		(74.1)	[1]	0.1	(0.2)
Income tax (benefit) expense		(4.1)		(15.2)	(41.8)
Net (loss) gain on disposal of discontinued businesses		(70.0)		15.3	41.6
Net (loss) gain from discontinued operations		(65.8)		5.4	36.3
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales		436.2		397.2	426.2
Cost of goods sold		350.8		331.8	355.8
Gross profit		85.4		65.4	70.4
Selling, general and administrative expenses		78.3		69.7	86.9
Operating (loss) income		7.1		(4.3)	(16.5)
Interest expense		1.2		0.3	0.7
Other non-operating (income) expense, net		(1.9)		1.7	(2.7)
(Loss) earnings from discontinued operations before income tax		7.8		(6.3)	(14.5)
Income tax (benefit) expense		3.6		(0.9)	16.8
Gain (Loss) earnings from discontinued operations		4.2		(5.4)	(31.3)
Gain (Loss) on expected disposal of discontinued businesses before income tax	[1]	(74.0)
Net (loss) gain on disposal of discontinued businesses		(74.0)
Net (loss) gain from discontinued operations		(69.8)		(5.4)	(31.3)
Flooring Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales				284.4	1,188.7
Cost of goods sold				237.2	962.3
Gross profit				47.2	226.4
Selling, general and administrative expenses				50.5	179.5
Operating (loss) income				(3.3)	46.9
Other non-operating (income) expense, net				1.1	3.1
(Loss) earnings from discontinued operations before income tax				(4.4)	43.8
Income tax (benefit) expense				0.1	17.8
Gain (Loss) earnings from discontinued operations				(4.5)	26.0
Gain (Loss) on expected disposal of discontinued businesses before income tax		(0.1)	[1]	0.1	(0.8)
Income tax (benefit) expense		(4.1)		(15.2)	(42.0)
Net (loss) gain on disposal of discontinued businesses		4.0		15.3	41.2
Net (loss) gain from discontinued operations		$ 4.0		$ 10.8	67.2
Cabinets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on expected disposal of discontinued businesses before income tax					0.6
Income tax (benefit) expense					0.2
Net (loss) gain on disposal of discontinued businesses					0.4
Net (loss) gain from discontinued operations					$ 0.4

[1] Loss on disposal of EMEA and Pacific Rim businesses for the year ended December 31, 2017 represents the estimated write-down of EMEA and Pacific Rim assets based on our expected sales proceeds to be received upon closure of the transaction.