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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 3.0 $ 10.9
Provision $ 0.9 $ 3.7 3.1 9.3
Cash Expenditures [1]     (3.0) (8.6)
Non-Cash Write-offs [2]       (0.3)
Ending Balance 3.1 11.4 3.1 11.4
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     2.4 10.4
Provision     2.6 7.6
Cash Expenditures [1]     (2.1) (6.6)
Ending Balance 2.9 $ 11.4 2.9 11.4
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.6 0.5
Provision     0.5 1.7
Cash Expenditures [1]     (0.9) (1.9)
Non-Cash Write-offs [2]       $ (0.3)
Ending Balance $ 0.2   $ 0.2  
[1] Cash expenditures primarily related to severance charges.
[2] Non-cash write-offs include asset impairment charges attributable to restructuring actions.