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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service cost $ 0.2 $ 0.1 $ 0.3 $ 0.2
Amortization of actuarial net gains $ 0.0 $ 0.5 0.1 1.0
Total reclassifications     (0.1) 0.6
Defined Benefit Pension Plan Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     (0.1) 0.6
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax     0.2 (0.8)
Income tax expense     (0.1) 0.2
Total reclassifications     0.1 (0.6)
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     0.3 0.2
Amortization of actuarial net gains     $ (0.1) $ (1.0)