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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 5.8 $ 3.0
Provision 0.8 2.2
Cash Expenditures [1] (2.0) (1.6)
Non-Cash Write-offs [2] (0.3)  
Ending Balance 4.3 3.6
Workforce Reduction Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 5.0 2.4
Provision 0.8 1.9
Cash Expenditures [1] (2.0) (1.0)
Ending Balance 3.8 3.3
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.8 0.6
Provision   0.3
Cash Expenditures [1]   (0.6)
Non-Cash Write-offs [2] (0.3)  
Ending Balance $ 0.5 $ 0.3
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions.