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Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the statutory federal income tax rate to the effective tax rate
Statutory federal income tax rate	21.00%	21.00%	35.00%
Effect of:
State and local income taxes	2.30%	3.20%	2.10%
Investment vehicles	(1.30%)	(1.20%)	(1.40%)
Domestic production activities			(3.10%)
Employee share-based payments	(3.30%)	(3.20%)	(5.90%)
Research and development credits	(1.10%)	(1.30%)	(0.90%)
Amended returns and refunds	0.10%	(1.60%)	(0.90%)
Tax credit reversal	3.70%
Other - net	0.80%	(0.30%)	(0.40%)
Pre-adjusted effective tax rate	22.20%	16.60%	24.50%
Effect of:
Tax Act		0.019	(0.408)
Subsidiary mergers			(4.20%)
Reported effective tax rate	22.20%	18.50%	(20.50%)

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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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