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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Gross unrecognized tax benefits | $ 114.6 |  | $ 109.1
The total amount of unrecognized tax benefits that would impact tax rate, if recognized | $ 69.7 |  |
Effective tax rate | 20.10% | 20.50% |

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