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Income Taxes - Effective Tax Rates (Details)	12 Months Ended
	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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- Definition

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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