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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
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Mar. 31, 2025 | Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of prior service cost | $ 0.0 | $ 0.1
Amortization of actuarial net gains | 0.0 | (0.1)
Total reclassifications | 0.0 | 0.0
Defined Benefit Pension Plan Items [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications | 0.0 | 0.0
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total before tax | 0.0 | 0.0
Income tax expense | 0.0 | 0.0
Total reclassifications | 0.0 | 0.0
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 | 0.0 | 0.1
Amortization of actuarial net gains | $ 0.0 | $ (0.1)

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