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Income Taxes - Roll-forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Income Tax Contingency [Line Items]    
Opening balance at January 1 $ 16.3  
Net change for tax positions of prior periods 0.0  
Closing balance at September 30 16.3  
Current 0.0  
Non-current 16.3 $ 16.3
Interest and Penalties [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1 3.1  
Net change for tax positions of prior periods 0.5  
Closing balance at September 30 3.6  
Current 0.0  
Non-current 3.6  
Unrecognized Tax Benefits [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1 13.2  
Net change for tax positions of prior periods (0.5)  
Closing balance at September 30 12.7  
Current 0.0  
Non-current $ 12.7