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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
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of prior service cost $ 8.4 $ 0.5 $ 0.5
Amortization of actuarial net losses/(gains) (0.2) (2.1) $ 0.5
Total reclassifications (98.5) 1.3  
Defined Benefit Pension Plan Items [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications (98.5) 1.3  
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total before tax 146.3 (1.6)  
Income tax expense (47.8) 0.3  
Total reclassifications 98.5 (1.3)  
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 8.4 0.5  
Amortization of actuarial net losses/(gains) (0.2) $ (2.1)  
Pension scheme settlement $ 138.1