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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal effect	2.00%	3.70%	3.20%
Tax expense due to federal tax reform	0.00%	0.00%	1.20%
Enacted United Kingdom tax rate change	2.80%	0.00%	0.00%
Foreign derived intangibles income deduction	(0.032)	(0.002)	(0.002)
Excess tax benefit from share-based awards	(3.90%)	(5.10%)	(2.20%)
Sale of businesses and subsidiary restructuring	0.70%	(2.60%)	1.30%
Unrecognized tax benefits	(1.00%)	(0.10%)	0.00%
Nondeductible executive compensation	2.00%	1.00%	0.20%
Valuation Allowance	(1.70%)	0.30%	0.00%
Other, net	(2.00%)	0.30%	(0.20%)
Effective income tax rate	16.70%	18.30%	24.30%

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Effective Income Tax Rate Reconciliation, Change In Enacted Foreign Tax Rate, Percent

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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 attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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