Restructuring And Optimization Programs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total restructuring charges	$ 2.4	$ 2.1	$ 12.2	$ 7.9
Period expected for cash payments for employee benefits and other costs			12 months
Organizational Optimization Plan [Member]
Total restructuring charges	1.2		$ 1.2
Total expected restructuring charges	1.5		1.5
Americas Manufacturing Optimization Plan [Member]
Additional restructuring charges		1.9	1.1	5.8
Total expected restructuring charges	8.7		8.7
Global Optimization Plan [Member]
Total restructuring charges	1.2	0.2	9.9	2.1
Discontinued Operations, Held-For-Sale [Member] | Tile Coating Systems [Member]
Additional restructuring charges	$ 0.3	$ 4.2	$ 2.3	$ 10.8