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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, 2022
Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications $ (0.2) $ (0.7)
Defined Benefit Pension Plan Items [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications (0.2) (0.7)
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 0.0 (0.1)
Total reclassifications 0.2 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 0.1 0.1
Amortization of actuarial net losses $ 0.1 $ 0.7