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Retirement Plans, Postretirement and Postemployment Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation for defined benefit pension plans | $ 881.9 | $ 789.6 |
Combined pension plan and SERP contributions | 31.8 | 90.2 |
Estimated contribution of pension plans | 32.7 |  |
Corporation's matching obligations | $ 22.3 | $ 23.1 | $ 20.5
Defined contribution plan name | 401(a) |  |
Defined benefit plans remeasurement increased | $ 47.6 |  |
Postretirement Health Care Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contribution of pension plans | $ 1.0 |  |

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