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Stockholders' Equity - Schedule of Adjustments to Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Unrealized net gains (losses) on defined benefit pension plan | $ 91.8 | $ (48.6)
Other Comprehensive Income (Loss) before Reclassifications, Tax, Total | 0.7 | 1.0
Foreign Currency Translation [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Unrealized net gains (losses) on defined benefit pension plan | 91.8 | (48.6)
Other Comprehensive Income (Loss) before Reclassifications, Tax, Total | $ 0.7 | $ 1.0

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