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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 10.9  
Provision $ 3.7 $ 6.1 9.3 $ 10.8
Cash Expenditures [1]     (8.6)  
Non-Cash Write-offs [2]     (0.3)  
Ending Balance 11.4   11.4  
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     10.4  
Provision     7.6  
Cash Expenditures [1]     (6.6)  
Ending Balance $ 11.4   11.4  
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.5  
Provision     1.7  
Cash Expenditures [1]     (1.9)  
Non-Cash Write-offs [2]     $ (0.3)  
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include asset impairment charges attributable to restructuring actions.