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Acquisition - Summary of Business Combination and Allocated the Purchase Consideration to Assets Acquired and Liabilities Assumed Based on Estimated Fair Values (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,196.2 | $ 1,002.2 | $ 981.9
Avanan [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 194.2 |  |
Core technology | 26.7 |  |
Customer relationship | 5.8 |  |
Net assets assumed | 0.4 |  |
Total | $ 227.1 |  |
Business combination core technology weighted average useful life | 8 years |  |
Business combination customer relationship weighted average useful life | 4 years |  |

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