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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits |  | $ 6.3 | $ 12.2
Income tax interest and penalty expense | $ 9.2 | 6.3 |
Accrued interest related to uncertain tax positions |  | $ 2.6 | $ 3.3

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