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Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Schedule Of Employee Benefit Plans [Line Items] |  |
Supplemental benefit plan liabilities | $ 402,700,000 | $ 380,000,000
Investment, indexed to Market Indices Fair Value | 191,500,000 |
Level 1 |  |
Schedule Of Employee Benefit Plans [Line Items] |  |
Derivative assets | $ 188,600,000 |
Maximum |  |
Schedule Of Employee Benefit Plans [Line Items] |  |
Future participant contributions percentage | 20.00% |

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