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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Effective Income Tax Rate
Statutory U.S. tax rate	21.00%	21.00%	21.00%
State income taxes--net of federal benefit	1.20%	0.50%	1.00%
International income taxes - net	(1.20%)	0.20%	0.20%
Global Intangible Low Taxed Income (GILTI)	0.80%	1.80%	1.10%
Foreign Derived Intangible Income (FDII)	(1.80%)	(2.90%)	(1.30%)
U.S. TCJA enactment - net impacts			0.025
U.S. research and development credit	(1.00%)	(1.70%)	(1.50%)
Reserves for tax contingencies	0.50%	2.30%	1.20%
Employee share-based payments	(0.50%)	(1.30%)	(1.40%)
All other--net	0.60%	(0.10%)	0.60%
Effective worldwide tax rate (as a percent)	19.60%	19.80%	23.40%

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This element represents the impact of employee share-based payments on the effective income tax rate.

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Percentage of reported income tax expense (benefit) attributable to the Foreign Derived Intangible Income (FDII) by the Tax Cuts and Jobs Act of 2017.

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Percentage of reported income tax expense (benefit) attributable to the Global Intangible Low Taxed Income (GILTI) by the Tax Cuts and Jobs Act of 2017.

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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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 other adjustments.

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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 revisions of previously reported income tax expense.

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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 state and local income tax expense (benefit), net of federal tax expense (benefit).

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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 research tax credit.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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