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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance, change in amount | $ (116.5) | $ 136.9 | $ (2.5)
Unrecognized tax benefits that would impact effective tax rate | 30.2 |  |
Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 9.2 |  |
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforward | 162.4 |  |
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforward | 129.3 |  |
State and Local Jurisdiction | California and New Jersey Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 23.1 |  |
Non-US |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforward | 110.1 | 713.8 |
Non-US | Capital Loss Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | $ 17.6 | $ 14.6 |

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