Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation of Statutory Federal Income Tax Rate to Effective Rate) (Details)

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Income Taxes (Reconciliation of Statutory Federal Income Tax Rate to Effective Rate) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Provision for federal income taxes at the statutory rate 21.00% 21.00% 21.00%
State and local income taxes, net of federal benefit 1.50% 1.70% 2.00%
Non-U.S. income taxes at different rates 2.10% (0.10%) (0.10%)
Foreign tax credits (0.90%) (0.10%) 0.00%
effective income tax rate reconciliation, foreign deferred tax asset, percent (1.20%) (2.10%) 0.00%
Reduction of uncrecognized tax benefits 0.10% 0.00% 0.40%
Research credits (1.40%) (0.50%) (0.60%)
Reduction of valuation allowance 0.50% 0.30% 0.40%
Excess tax benefits from stock plans (0.80%) (1.60%) (1.40%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent 0.00% 0.00% (1.40%)
Other 1.70% (0.10%) 0.70%
Actual provision for income taxes 22.60% 18.50% 23.80%