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Income Taxes - Roll-forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Income Tax Contingency [Line Items]    
Opening balance at January 1 $ 14.8  
Net change for tax positions of prior periods 0.2  
Closing balance at March 31 15.0  
Current (4.5) $ (1.2)
Non-current 10.5 $ 13.6
Interest and Penalties [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1 4.3  
Net change for tax positions of prior periods 0.3  
Closing balance at March 31 4.6  
Current (1.3)  
Non-current 3.3  
Unrecognized Tax Benefits [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1 10.5  
Net change for tax positions of prior periods (0.1)  
Closing balance at March 31 10.4  
Current (3.2)  
Non-current $ 7.2