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Income Taxes, U.S. statutory federal tax rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Differences between the U.S. statutory federal tax rate and the Company's effective income tax rate
U.S. statutory federal tax rate (as a percent)	21.00%	21.00%	21.00%
State and local taxes (as a percent)	0.80%	0.70%	0.60%
Foreign earnings and dividends taxed at different rates (as a percent)	2.10%	1.40%	2.30%
U.S. tax on foreign income (as a percent)	0.80%	1.20%	1.80%
Tax Act - transition tax (as a percent)	0	0	0.007
Tax Act - change in indefinite reinvestment assertion	0.00%	0.00%	(1.60%)
Excess tax benefits related to stock-based compensation (as a percent)	(2.80%)	(2.50%)	(1.20%)
Settlements of refund claims in foreign jurisdictions including related deferred taxes (as a percent)	(1.30%)	0.00%	0.00%
Other, net (as a percent)	(0.10%)	0.40%	(0.20%)
Effective tax rate (as a percent)	20.50%	22.20%	23.40%

X

- Definition

Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to the change in indefinite reinvestment assertion relating to Tax Cuts and Jobs Act.

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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 United States federal and state tax on applicable foreign activity and repatriation of earnings from foreign subsidiaries.

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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 difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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 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 increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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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 foreign income tax settlement.

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