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Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications | $ 0.9 | $ (0.7)
Defined Benefit Pension Plan Items [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications | 0.9 | (0.7)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total before tax | (1.2) | 0.8
Income tax expense | 0.3 | (0.1)
Total reclassifications | (0.9) | 0.7
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] | Defined Benefit Pension Plan Items [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of prior service cost | 0.4 | 0.4
Amortization of actuarial net losses | $ (1.6) | $ 0.4

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