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Employee Benefit Plans - Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefit - Pension Benefits (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
--- | --- | --- | ---
Cumulative effect adjustment |  |  | $ 1,211.0
ASU 2018-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Cumulative effect adjustment |  | $ 30.8 |
Defined Benefit Pension Plan [Member] |  |  |
Accumulated other comprehensive loss, tax | $ 51.4 | $ 57.8 |

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