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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Holiday [Line Items] |  |  |  |
Swiss tax benefits, net of valuation allowance | $ 92.3 | $ 0.0 | $ 0.0 |
Swiss tax benefits, valuation allowance | 67.3 |  |  |
One-time tax benefit | 67.1 | 0.0 | 66.4 |
Excise tax accrued | 0.0 |  |  |
Net operating loss carryforwards | 38.2 |  |  |
Swiss tax credit carryforwards | 122.4 | 0.0 |  |
Research and development credit carryforwards | 193.2 | 156.7 |  |
Valuation allowance | 269.8 | 168.6 |  |
Gross interest related to unrecognized tax benefits accrued | 31.2 | 21.0 | 14.9 |
Total gross unrecognized tax benefits | 260.4 | 252.6 | $ 222.5 | $ 176.3
Unrecognized tax benefits that would impact effective tax rate | 181.8 |  |  |
Interest and penalties related to unrecognized tax benefits accrued |  | $ 13.6 |  |
Research Tax Credit Carryforward, Other |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |
Research and development credit carryforwards | 5.2 |  |  |
California Franchise Tax Board | Research Tax Credit Carryforward, State |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |
Research and development credit carryforwards | $ 267.7 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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