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Income Taxes - Reconciliation of Difference Between Provision for Income Taxes and Expected Tax Provision at Weighted Average Tax Rate (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]    
Income tax provision (benefit) at expected rate $ 5.7 $ (5.4)
Tax effect of:    
Foreign exchange adjustments 0.0 (2.6)
Impact of change in tax rate related to Finance Act 2021 0.0 (0.5)
Prior period adjustment (4.4) 0.0
Other 0.3 0.0
Income tax provision (benefit) $ 1.6 $ (8.5)