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Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional income tax expense |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.5 | $ 317.8 |
U.S. tax on foreign earnings |  |  |  |  |  |  |  |  |  |  | 55.0 | 43.7 | 8.4 |
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 47.6 |
Estimated cumulative undistributed foreign earnings |  | $ 1,600.0 |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax remeasurement due to Swiss Tax Reform | $ 51.3 |  |  |  |  |  |  |  |  |  | 51.3 | 0.0 | 0.0 |
Valuation allowance |  |  | $ (57.2) |  |  |  | $ (42.3) |  |  |  | (57.2) | (42.3) |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount |  |  | 33.7 | $ 28.8 | $ 11.3 | $ 72.7 | 15.8 | $ 24.1 | $ 21.6 | $ 54.7 | 146.5 | 116.2 | 102.8 |
Total gross unrecognized tax benefits |  |  | 96.7 |  |  |  | 78.8 |  |  |  | 96.7 | 78.8 | 65.4 | $ 106.0
Net increase in gross unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  | 17.9 |  |  |
Interest and penalties related to unrecognized tax benefits accrued |  |  | $ 2.9 |  |  |  | $ 2.6 |  |  |  | $ 2.9 | $ 2.6 | 1.8 |
Swiss Federal Tax Administration (FTA) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit from tax holiday |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.9 |
Tax benefit from tax holiday (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.09 |
Pro forma |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. tax on foreign earnings |  |  |  |  |  |  |  |  |  |  |  |  | $ 270.2 |

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