Income Taxes (Schedule Of Income Tax Expense From Continuing Operations Percentage) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	1.50%	0.80%	1.30%
Tax effect of foreign operations	(0.90%)	(2.20%)	(1.70%)
Global intangible low-taxed income	0.50%	(0.30%)	2.30%
Current and deferred foreign withholding taxes	2.30%	2.70%	1.30%
Stock-based compensation	(0.50%)	(0.60%)	(1.10%)
Change in valuation allowance	0.00%	0.80%	0.40%
Change in uncertain tax positions, net	0.00%	0.60%	(0.30%)
Goodwill impairment	0.00%	1.60%	0.00%
Other permanent differences, net	(0.80%)	(1.30%)	(0.30%)
Other, net	(0.20%)	(0.30%)	(0.70%)
Effective tax rate	22.90%	22.80%	22.20%