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Income Taxes - Roll-forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Income Tax Contingency [Line Items]    
Opening balance at January 1 $ 14.8  
Increase for tax positions of prior periods 0.5  
Decrease for settlement of tax positions (3.4)  
Closing balance at June 30 11.9  
Current (1.2) $ (1.2)
Non-current 10.7 $ 13.6
Interest and Penalties [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1 4.3  
Increase for tax positions of prior periods 0.5  
Decrease for settlement of tax positions (1.1)  
Closing balance at June 30 3.7  
Current (0.2)  
Non-current 3.5  
Unrecognized Tax Benefits [Member]    
Income Tax Contingency [Line Items]    
Opening balance at January 1 10.5  
Increase for tax positions of prior periods 0.0  
Decrease for settlement of tax positions (2.3)  
Closing balance at June 30 8.2  
Current (1.0)  
Non-current $ 7.2