Restructuring And Cost Reduction Programs (Summary of Charges Associated with Restructuring Programs by Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Total Expected Charges	$ 12,604
Restructuring charges incurred	17,425	$ 10,955	$ 7,116
Cumulative charges to date	94,738
Operating Segments [Member]
Restructuring Cost And Reserve [Line Items]
Total Expected Charges	268
Restructuring charges incurred	128	119	171
Cumulative charges to date	31,516
Functional Coatings [Member] | Operating Segments [Member]
Restructuring Cost And Reserve [Line Items]
Total Expected Charges	169
Restructuring charges incurred	27	(5)	23
Cumulative charges to date	26,954
Color Solutions [Member] | Operating Segments [Member]
Restructuring Cost And Reserve [Line Items]
Total Expected Charges	99
Restructuring charges incurred	101	124	148
Cumulative charges to date	4,562
Corporate Restructuring Charges [Member]
Restructuring Cost And Reserve [Line Items]
Total Expected Charges	12,336
Restructuring charges incurred	17,297	$ 10,836	$ 6,945
Cumulative charges to date	$ 63,222