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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 3.0 $ 10.9
Provision $ 0.4 $ 3.1 3.5 12.4
Cash Expenditures [1]     (4.2) (18.0)
Non-Cash Write-offs     (0.5) (0.4) [2]
Ending Balance 1.8 4.9 1.8 4.9
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     2.4 10.4
Provision     2.8 8.7
Cash Expenditures [1]     (2.9) (15.0)
Non-Cash Write-offs     (0.5) 0.2 [2]
Ending Balance 1.8 4.3 1.8 4.3
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.6 0.5
Provision     0.7 3.7
Cash Expenditures [1]     (1.3) (3.0)
Non-Cash Write-offs [2]       (0.6)
Ending Balance $ 0.0 $ 0.6 $ 0.0 $ 0.6
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include asset impairment charges attributable to restructuring actions.