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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Income tax effective rate | 11.50% | (50.90%) | 300.30% | (28.40%)
CARES Act income tax expenses benefit |  |  | $ 0.0 |
Internal Revenue Service [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Income tax benefit | $ 0.1 |  | 17.8 |
Minimum [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Decrease in unrecognized tax benefits | 0.1 |  | 0.1 |
Maximum [Member] |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |
Decrease in unrecognized tax benefits | $ 0.6 |  | $ 0.6 |

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