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Income Taxes - Reconciliation of U.S. Federal Statutory Tax Rate to Company's Effective Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income tax provision |  |  |
Statutory U.S. federal tax rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit | 3.50% | 3.50% | 3.50%
Foreign operations | (1.70%) | (8.50%) | (471.20%)
Compensation plans | 2.00% | 5.80% | 240.60%
Changes in tax laws | 2.40% | 3.00% | 0.00%
Change in valuation allowances | 1.10% | 6.90% | (107.20%)
Unrecognized tax benefits | 0.10% | (1.10%) | 420.40%
Affiliate divestments | 0.00% | (6.20%) | (120.40%)
Changes in U.S. tax provision to return | 0.40% | 0.80% | (195.70%)
Other | 0.10% | 0.40% | 72.00%
Effective tax rate | 22.00% | 16.00% | 0.90%
Controlling Interest |  |  |
Income tax provision |  |  |
Effective tax rate | 28.90% | 25.60% | (137.00%)
Non-controlling interests: |  |  |
Income tax provision |  |  |
Effect of income from non-controlling interests | (6.90%) | (9.60%) | 137.90%

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