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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Income tax effective rate | 9.50% |  | 181.40% | 164.70% | 107.90%
Income tax benefit reversed | $ 3.0 |  |  |  |
CARES Act income tax expenses benefit |  |  |  | $ 0.0 |
Internal Revenue Service [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Income tax benefit |  | $ 17.8 |  | 17.8 |
Income tax expense | 0.1 |  |  |  |
Minimum [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Decrease in unrecognized tax benefits | 0.2 |  |  | 0.2 |
Maximum [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Decrease in unrecognized tax benefits | $ 0.7 |  |  | $ 0.7 |

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