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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 6.8 $ 10.5
Provision 4.5 1.2
Cash Expenditures [1] (3.2) (4.9)
Non-Cash Write-offs 0.4 (0.1)
Ending Balance 8.5 6.7
Workforce Reduction Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 6.7 9.9
Provision 4.2 0.7
Cash Expenditures [1] (3.0) (4.3)
Non-Cash Write-offs   (0.1)
Ending Balance 7.9 6.2
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.1 0.6
Provision 0.3 0.5
Cash Expenditures [1] (0.2) (0.6)
Non-Cash Write-offs 0.4  
Ending Balance $ 0.6 $ 0.5
[1] Cash expenditures primarily relate to severance charges.