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Income Taxes - Effective Tax Rates (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective tax rate reconciliation |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefits | 0.20% | 0.50% | 1.40%
Foreign rate differential, net of United States tax paid on foreign earnings (3.3%, 5.6%, and 2.3%, respectively) | (9.50%) | (8.30%) | (5.50%)
Divestitures |  |  | 2.40%
Change in Business Solutions permanent reinvestment assertion | 1.90% |  |
Lapse of statute of limitations | (0.50%) | (0.70%) | (0.50%)
Valuation allowances |  | 0.20% | 0.10%
Other | 0.80% | 0.20% | 1.00%
Effective tax rate | 13.90% | 12.90% | 19.90%
US tax paid on foreign earnings | 3.30% | 5.60% | 2.30%

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