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Restructuring and Other Charges (Gains) - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 5.7 $ 7.6
Provision 0.6 7.6
Cash Expenditures [1] (3.9) (5.0)
Ending Balance 2.4 10.2
Workforce Reduction Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 4.7 6.9
Provision 0.6 6.5
Cash Expenditures [1] (3.9) (4.6)
Ending Balance 1.4 8.8
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 1.0 0.7
Provision   1.1
Cash Expenditures [1]   (0.4)
Ending Balance $ 1.0 $ 1.4
[1] Cash expenditures primarily relate to severance charges.