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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 5.8 $ 3.0
Provision $ 10.8 $ 0.9 11.6 3.1
Cash Expenditures [1]     (4.2) (3.0)
Non-Cash Write-offs [2]     (0.6)  
Ending Balance 12.6 3.1 12.6 3.1
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     5.0 2.4
Provision     11.1 2.6
Cash Expenditures [1]     (3.7) (2.1)
Ending Balance 12.4 2.9 12.4 2.9
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.8 0.6
Provision     0.5 0.5
Cash Expenditures [1]     (0.5) (0.9)
Non-Cash Write-offs [2]     (0.6)  
Ending Balance $ 0.2 $ 0.2 $ 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.