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Retirement Plans, Postretirement and Postemployment Benefits - Schedule of Amounts Recognized on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
Noncurrent asset pension and postretirement benefits | $ 307.8 | $ 295.3
Current pension and postretirement benefits | (7.5) | (6.8)
Noncurrent pension, postretirement and postemployment benefits | (92.7) | (79.0)
Net amount recognized at end of year | 207.6 | 209.5
Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized at end of year | (8.3) | (8.9)
Current pension and postretirement benefits | (1.0) | (1.0)
Noncurrent pension, postretirement and postemployment benefits | (7.3) | (7.9)
Net amount recognized at end of year | $ (8.3) | $ (8.9)

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