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Pension - Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss |  |  |
Net loss (gain) | $ 2.6 | $ 17.0 | $ (4.8)
Pension Benefits |  |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss |  |  |
Net loss (gain) | 2.4 | 17.2 | (4.7)
Prior service cost | 0.0 | 0.0 | 0.4
Amortization of net loss | (1.5) | (0.5) | (0.7)
Amortization of prior service cost | 0.1 | (0.2) | (0.1)
Curtailments | (0.3) | 1.0 | 0.0
Total recognized in other comprehensive income | 0.7 | 17.5 | (5.1)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | $ 2.9 | $ 14.9 | $ (12.1)

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