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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 10.5 $ 5.8
Provision 1.2 0.8
Cash Expenditures [1] (4.9) (2.0)
Non-Cash Write-offs [2] (0.1) (0.3)
Ending Balance 6.7 4.3
Workforce Reduction Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 9.9 5.0
Provision 0.7 0.8
Cash Expenditures [1] (4.3) (2.0)
Non-Cash Write-offs [2] (0.1)  
Ending Balance 6.2 3.8
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.6 0.8
Provision 0.5  
Cash Expenditures [1] (0.6)  
Non-Cash Write-offs [2]   (0.3)
Ending Balance $ 0.5 $ 0.5
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions.