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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 10.9 $ 7.9  
Provision 13.9 16.6 $ 7.0
Cash Expenditures [1] (21.6) (11.9)  
Non-Cash Write-offs (0.2) [2] (1.7) [3]  
Ending Balance 3.0 10.9 7.9
Workforce Reduction Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 10.4 7.9  
Provision 9.3 13.3  
Cash Expenditures [1] (17.5) (11.2)  
Non-Cash Write-offs 0.2 [2] 0.4 [3]  
Ending Balance 2.4 10.4 $ 7.9
Asset Disposals [Member]      
Restructuring Cost and Reserve [Line Items]      
Provision 0.1 0.7  
Non-Cash Write-offs (0.1) [2] (0.7) [3]  
Contract Termination Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Provision   0.2  
Non-Cash Write-offs [3]   (0.2)  
Other [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0.5    
Provision 4.5 2.4  
Cash Expenditures [1] (4.1) (0.7)  
Non-Cash Write-offs (0.3) [2] (1.2) [3]  
Ending Balance $ 0.6 $ 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.
[3] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions and the benefit from release of a foreign currency gain associated with the dissolution of a foreign entity