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Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications $ 0.9 $ (0.7)
Defined Benefit Pension Plan Items [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications 0.9 (0.7)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax (1.2) 0.8
Income tax expense 0.3 (0.1)
Total reclassifications (0.9) 0.7
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 losses $ (1.6) $ 0.4