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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]        
Balance at December 31 2014     $ 7.9  
Provision $ 6.1 $ 0.7 10.8 $ 0.9
Cash Expenditures [1]     (6.7)  
Non-Cash Write-offs [2]     (0.8)  
Balance at June 30 2015 11.2   11.2  
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Balance at December 31 2014     7.9  
Provision     9.6  
Cash Expenditures [1]     (6.7)  
Non-Cash Write-offs [2]     0.4  
Balance at June 30 2015 $ 11.2   11.2  
Asset Disposals [Member]        
Restructuring Cost and Reserve [Line Items]        
Provision     1.0  
Non-Cash Write-offs [2]     (1.0)  
Contract Termination Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Provision     0.2  
Non-Cash Write-offs [2]     $ (0.2)  
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions