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Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax provision at statutory rate based on income before income taxes (percent)	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation Tax Reform, Domestic	1.80%	(111.00%)	0.00%
Effective Income Tax Rate Reconciliation Tax Reform, International	(3.60%)	(0.00%)	(0.00%)
Effective Income Tax Rate Reconciliation, Consolidated Group Restructuring	0.00%	(7.40%)	0.00%
Foreign income taxes (percent)	3.60%	(5.30%)	(6.80%)
Federal research credit (percent)	(2.80%)	(2.80%)	(5.60%)
Settlement of taxing authority examinations (percent)	(0.70%)	(2.10%)	(3.50%)
Stock-based compensation (percent)	(1.60%)	(2.10%)	(0.00%)
European permanent deduction (percent)	(0.20%)	(0.50%)	(3.40%)
Non deductible/non-taxable items (percent)	(1.20%)	(0.50%)	7.20%
State income taxes, net of federal tax benefit (percent)	1.60%	2.80%	1.70%
Effective Income Tax Rate Reconciliation, US tax on worldwide earnings at different rates, Percent	2.90%	0.00%	0.00%
Other, net (percent)	(1.50%)	0.80%	(0.30%)
Effective income tax rate, continuing operations (percent)	19.30%	(93.10%)	24.30%

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Effective Income Tax Rate Reconciliation, Consolidated Group Restructuring

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Percentage of reported income tax expense (benefit) attributable to 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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