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Pensions and Other Post-retirement 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] |  |  |
Estimated contributions by employer to pension plans | $ 5.0 |  |
Percentage increase in the costs of covered health care benefits assumed when measuring net periodic benefit expense | 6.50% |  |
Percentage decrease in health care benefits for successive year | 0.20% |  |
Ultimate health care cost trend rate when measuring net periodic benefit expense | 4.40% |  |
Percentage increase in health care benefit cost | 6.70% |  |
Estimated future percentage of health care benefits | 4.40% |  |
Defined contribution pension plan expense | $ 13.4 | $ 12.6 | $ 11.7
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated benefit payments, year one | 31.6 |  |
Estimated benefit payments, year two | 31.3 |  |
Estimated benefit payments, year three | 31.7 |  |
Estimated benefit payments, year four | 32.2 |  |
Estimated benefit payments, year five | 32.8 |  |
Estimated benefit payments, five years thereafter | 171.7 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated benefit payments, year one | 2.2 |  |
Estimated benefit payments, year two | 1.9 |  |
Estimated benefit payments, year three | 1.9 |  |
Estimated benefit payments, year four | 2.0 |  |
Estimated benefit payments, year five | 1.9 |  |
Estimated benefit payments, five years thereafter | $ 9.0 |  |

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