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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 7.6 $ 6.8
Provision 7.6 4.5
Cash Expenditures [1] (5.0) (3.2)
Non-Cash Write-offs   0.4
Ending Balance 10.2 8.5
Workforce Reduction Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 6.9 6.7
Provision 6.5 4.2
Cash Expenditures [1] (4.6) (3.0)
Ending Balance 8.8 7.9
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.7 0.1
Provision 1.1 0.3
Cash Expenditures [1] (0.4) (0.2)
Non-Cash Write-offs   0.4
Ending Balance $ 1.4 $ 0.6
[1] Cash expenditures primarily relate to severance charges.