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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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