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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax rate 21.00% 21.00% 21.00%
State and local income taxes, net of federal benefit 3.00% 4.00% 2.00%
Effect of foreign operations (1.00%) 2.00% 2.00%
Non-deductible compensation expenses 2.00% 1.00% 1.00%
Excess tax deficiencies related to share-based compensation (1.00%) 2.00% 0.00%
Nontaxable income attributable to noncontrolling interests (1.00%) (1.00%) (1.00%)
Changes in the valuation allowance 3.00% 10.00% (4.00%)
Tax expense relating to uncertain tax positions, including accrued interest, net of deferred tax benefits 1.00% (1.00%) 0.00%
Deferral of investment tax credit benefit (1.00%) (1.00%) (2.00%)
Other (1.00%) (1.00%) (3.00%)
Effective income tax rate 25.00% 36.00% 16.00%