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Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract] |  |  |
Defined benefit plan contributions | $ 0.0 | $ 0.1 |
Unfunded liability plans | $ 9.5 |  | $ 9.7

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