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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from disposal of discontinued businesses, before income tax		$ 0.0		$ 0.0
Income tax benefit	$ 0.0	(3.0)	$ 0.0	(3.0)
Earnings from disposal of discontinued businesses, net of tax	0.0	3.0	0.0	3.0
Net earnings from discontinued operations	$ 0.0	3.0	$ 0.0	3.0
EMEA and Pacific Rim Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from disposal of discontinued businesses, before income tax		0.0		0.0
Income tax benefit		(2.0)		(2.0)
Earnings from disposal of discontinued businesses, net of tax		2.0		2.0
Net earnings from discontinued operations		2.0		2.0
Armstrong Flooring Inc [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from disposal of discontinued businesses, before income tax		0.0		0.0
Income tax benefit		(1.0)		(1.0)
Earnings from disposal of discontinued businesses, net of tax		1.0		1.0
Net earnings from discontinued operations		$ 1.0		$ 1.0