Income Taxes (Schedule Of Income Tax Expense From Continuing Operations Percentage) (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	0.80%	1.40%	0.90%
Tax effect of foreign operations	(2.20%)	(1.60%)	(0.70%)
Global intangible low-taxed income	(0.40%)	2.20%	0.70%
Current and deferred foreign withholding taxes	2.80%	1.20%	3.80%
Stock-based compensation	(0.60%)	(1.10%)	(0.80%)
Change in valuation allowance	0.80%	0.40%	(2.00%)
Change in uncertain tax positions, net	0.60%	(0.30%)	(0.30%)
Goodwill impairment	1.70%	0.00%	0.00%
Other permanent differences, net	(1.40%)	(0.30%)	(1.40%)
Other, net	(0.30%)	(0.50%)	(0.80%)
Effective tax rate	22.80%	22.40%	20.40%

Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income, Percent

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Effective Income Tax Rate Reconciliation Permanent Differences

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Effective Income Tax Reconciliation, Foreign Withholding Tax, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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