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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 5.8 $ 3.0
Provision $ 5.7 $ 0.4 17.3 3.5
Cash Expenditures [1]     (12.5) (4.2)
Non-Cash Write-offs [2]     (0.6) (0.5)
Ending Balance 10.0 1.8 10.0 1.8
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     5.0 2.4
Provision     16.0 2.8
Cash Expenditures [1]     (11.3) (2.9)
Non-Cash Write-offs [2]       (0.5)
Ending Balance 9.7 $ 1.8 9.7 1.8
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.8 0.6
Provision     1.3 0.7
Cash Expenditures [1]     (1.2) $ (1.3)
Non-Cash Write-offs [2]     (0.6)  
Ending Balance $ 0.3   $ 0.3  
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include asset impairment charges attributable to restructuring actions.