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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, 2023
Mar. 31, 2022
Income Tax Disclosure [Abstract]    
Income tax provision at expected rate $ (5.4) $ 9.4
Tax effect of:    
Nontaxable investment income 0.0 (0.1)
Foreign exchange adjustments (2.6) 0.1
Sale of Brazil and Malta Operations 0.0 1.6
Change in uncertain tax position liability 0.0 0.1
Change in valuation allowance 0.0 (1.8)
Impact of change in tax rate related to Finance Act 2021 (0.5) 0.5
Prior period adjustment 0.0 2.0
Other 0.0 1.2
Income tax provision (benefit) $ (8.5) $ 13.0