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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. tax on foreign earnings |  |  |  |  |  |  |  |  |  | $ 29.3 | $ 55.0 | $ 43.7 |
Deferred tax remeasurement due to Swiss Tax Reform | $ 51.3 |  |  |  |  |  |  |  |  | 0.0 | 51.3 | 0.0 |
Valuation allowance |  | $ (81.4) |  |  |  | $ (57.2) |  |  |  | (81.4) | (57.2) |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount |  | 21.3 | $ 47.9 | $ 31.6 | $ 65.4 | 33.7 | $ 28.8 | $ 11.3 | $ 72.7 | 166.2 | 146.5 | 116.2 |
Total gross unrecognized tax benefits |  | 176.3 |  |  |  | 96.7 |  |  |  | 176.3 | 96.7 | 78.8 | $ 65.4
Net increase in gross unrecognized tax benefits |  |  |  |  |  |  |  |  |  | 39.3 |  |  |
Interest and penalties related to unrecognized tax benefits accrued |  | 11.0 |  |  |  | $ 2.9 |  |  |  | 11.0 | $ 2.9 | $ 2.6 |
Swiss Federal Tax Administration (FTA) |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  | 253.0 |  |  |  |  |  |  |  | 253.0 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  | $ 534.0 |  |  |  |  |  |  |  | $ 534.0 |  |  |

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