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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 10.9  
Provision 5.6 $ 4.7
Cash Expenditures [1] (2.1)  
Non-Cash Write-offs [2] (0.1)  
Ending Balance 14.3  
Workforce Reduction Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 10.4  
Provision 5.4  
Cash Expenditures [1] (1.8)  
Ending Balance 14.0  
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.5  
Provision 0.2  
Cash Expenditures [1] (0.3)  
Non-Cash Write-offs [2] (0.1)  
Ending Balance $ 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