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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 29.7 $ 4.0
Provision $ 3.7 $ 20.6 28.9 22.2
Cash Expenditures [1]     (17.6) (4.6)
Non-cash write-offs     (15.1)  
Ending Balance 25.9 21.6 25.9 21.6
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     16.2 3.2
Provision     16.6 14.0
Cash Expenditures [1]     (16.3) (4.6)
Non-cash write-offs     0.6  
Ending Balance 17.1 12.6 17.1 12.6
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     13.5 0.8
Provision     12.3 8.2
Cash Expenditures [1]     (1.3) 0.0
Non-cash write-offs     (15.7)  
Ending Balance $ 8.8 $ 9.0 $ 8.8 $ 9.0
[1] (a) Cash expenditures primarily relate to severance charges.