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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Holiday [Line Items]
Document Fiscal Year Focus	2018
Effective Income Tax Rate Reconciliation [Abstract]
U.S. Federal income tax rate	21.00%	35.00%	35.00%
State and local taxes, net of Federal income tax benefit	0.40%	(0.20%)	1.10%
Foreign operations tax effect	4.00%	27.00%	(22.50%)
Research & experimentation tax credits	(5.00%)	(11.60%)	(6.60%)
Valuation allowance	22.90%	60.80%	69.60%
Tax contingencies	(4.30%)	6.60%	(0.60%)
Tax holiday	(24.30%)	(78.00%)	(64.20%)
Foreign taxes	0.90%	(5.00%)	2.80%
Other, principally non-tax deductible items (1)	1.40%	(0.80%)	3.20%
Stock-based compensation	3.10%	9.30%	9.60%
Other, principally non-tax deductible items (1)	3.20%	13.50%	1.90%
Transition tax	(28.90%)	89.70%	0.00%
Tax reform	(1.70%)	(85.30%)	0.00%
Prior period items	(0.10%)	5.50%	0.20%
Effective income tax rate	(7.40%)	66.50%	29.50%
Foreign Tax Authority
Income Tax Holiday [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		18.50%
Effective Income Tax Rate Reconciliation [Abstract]
Tax holiday	(7.20%)
Effective income tax rate reconciliation, tax holiday	$ 13.3	$ 13.8	$ 16.3
Income tax holiday benefit (usd per share)	$ 0.15	$ 0.15	$ 0.18
Inland Revenue, Singapore (IRAS) | Foreign Tax Authority
Effective Income Tax Rate Reconciliation [Abstract]
Foreign statutory income tax rate	24.00%

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