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Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of prior service cost | $ 0.0 | $ 8.4 | $ 0.5
Amortization of actuarial net losses/(gains) | 0.0 | (0.2) | $ (2.1)
Total reclassifications | (0.0) | (98.5) |
Defined Benefit Pension Plan Items [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications | 0.0 | (98.5) |
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total before tax | 0.0 | 146.3 |
Income tax expense | 0.0 | (47.8) |
Total reclassifications | 0.0 | (98.5) |
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 | 8.4 |
Amortization of actuarial net losses/(gains) | $ 0.0 | (0.2) |
Pension scheme settlement |  | $ 138.1 |

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