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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]        
Balance at December 31 2014     $ 7.9  
Provision $ 1.8 $ 0.2 12.6 $ 1.1
Cash Expenditures [1]     (8.4)  
Non-Cash Write-offs [2]     (0.6)  
Balance at September 30 2015 11.5   11.5  
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Balance at December 31 2014     7.9  
Provision     11.4  
Cash Expenditures [1]     (8.7)  
Non-Cash Write-offs [2]     0.5  
Balance at September 30 2015 11.1   11.1  
Asset Disposals [Member]        
Restructuring Cost and Reserve [Line Items]        
Provision     0.5  
Cash Expenditures [1]     0.4  
Non-Cash Write-offs [2]     (0.9)  
Contract Termination Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Provision     0.2  
Non-Cash Write-offs [2]     (0.2)  
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Provision     0.5  
Cash Expenditures [1]     (0.1)  
Balance at September 30 2015 $ 0.4   $ 0.4  
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions.