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Pensions and Other Post-retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage increase in the costs of covered health care benefits assumed when measuring net periodic benefit expense |  | 6.70% |
Percentage decrease in health care benefits for successive year | 0.30% | 0.20% |
Ultimate health care cost trend rate when measuring net periodic benefit expense |  | 4.40% |
Percentage increase in health care benefit cost | 7.80% |  |
Estimated future percentage of health care benefits | 4.50% |  |
Defined contribution pension plan expense | $ 13.6 | $ 13.4 | $ 12.6
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contributions by employer to pension plans | 6.0 |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contributions by employer to pension plans | 8.0 |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated benefit payments, year one | 30.5 |  |
Estimated benefit payments, year two | 30.4 |  |
Estimated benefit payments, year three | 30.7 |  |
Estimated benefit payments, year four | 31.3 |  |
Estimated benefit payments, year five | 31.9 |  |
Estimated benefit payments, five years thereafter | 167.7 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated benefit payments, year one | 2.1 |  |
Estimated benefit payments, year two | 2.1 |  |
Estimated benefit payments, year three | 2.3 |  |
Estimated benefit payments, year four | 2.2 |  |
Estimated benefit payments, year five | 2.2 |  |
Estimated benefit payments, five years thereafter | $ 10.2 |  |

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