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Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior service cost | $ 0.1 | $ 0.2 | $ 0.4 | $ 0.4
Amortization of actuarial net gains | $ 0.1 | $ 0.6 | 0.2 | 1.6
Total reclassifications |  |  | (0.1) | 0.9
Defined Benefit Pension Plan Items [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications |  |  | (0.1) | 0.9
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax |  |  | 0.2 | (1.2)
Income tax expense |  |  | (0.1) | 0.3
Total reclassifications |  |  | 0.1 | (0.9)
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 gains |  |  | $ (0.2) | $ (1.6)

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