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Income Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Tax Examination [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 7.70% | 21.50% | (25.00%) | 10.90%
Contingent liabilities - Pfenex |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Reduction in contingent liability | $ 34.1 |  | $ 33.8 |

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