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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 7.6 $ 6.8  
Provision 13.5 15.9 $ 14.7
Cash Expenditures [1] (15.4) (15.1)  
Ending Balance 5.7 7.6 6.8
Workforce Reduction Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 6.9 6.7  
Provision 11.4 14.6  
Cash Expenditures [1] (13.6) (14.4)  
Ending Balance 4.7 6.9 6.7
Other [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0.7 0.1  
Provision 2.1 1.3  
Cash Expenditures [1] (1.8) (0.7)  
Ending Balance $ 1.0 $ 0.7 $ 0.1
[1] Cash expenditures primarily related to severance charges.