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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 3.0 $ 10.9
Provision 2.2 5.6
Cash Expenditures [1] (1.6) (2.1)
Non-Cash Write-offs [2]   (0.1)
Ending Balance 3.6 14.3
Workforce Reduction Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 2.4 10.4
Provision 1.9 5.4
Cash Expenditures [1] (1.0) (1.8)
Ending Balance 3.3 14.0
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.6 0.5
Provision 0.3 0.2
Cash Expenditures [1] (0.6) (0.3)
Non-Cash Write-offs [2]   (0.1)
Ending Balance $ 0.3 $ 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.