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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards |  |
Foreign pre-tax loss | $ 3.0 | $ 8.2
Federal |  |
Operating Loss Carryforwards |  |
Net operating loss carryforwards | 636.8 |
Net operating loss carryforwards with no expiration date | 75.0 |
Federal | R&D credit |  |
Operating Loss Carryforwards |  |
Tax credit carryforwards | 31.0 |
State |  |
Operating Loss Carryforwards |  |
Net operating loss carryforwards | 532.4 |
State | R&D credit |  |
Operating Loss Carryforwards |  |
Tax credit carryforwards | $ 11.1 |

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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