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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
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of prior service cost $ 0.1 $ 0.1
Amortization of actuarial net losses/(gains) 0.1 0.5
Total reclassifications 0.0 0.3
Defined Benefit Pension Plan Items [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications 0.0 0.3
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 0.0 (0.4)
Income tax expense 0.0 0.1
Total reclassifications 0.0 (0.3)
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 0.1 0.1
Amortization of actuarial net losses/(gains) $ (0.1) $ (0.5)