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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 10.5 $ 5.8
Provision $ 4.5 $ 10.8 5.7 11.6
Cash Expenditures [1]     (6.6) (4.2)
Non-Cash Write-offs     (0.1) (0.6) [2]
Ending Balance 9.5 12.6 9.5 12.6
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     9.9 5.0
Provision     4.9 11.1
Cash Expenditures [1]     (5.7) (3.7)
Non-Cash Write-offs     (0.1)  
Ending Balance 9.0 12.4 9.0 12.4
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.6 0.8
Provision     0.8 0.5
Cash Expenditures [1]     (0.9) (0.5)
Non-Cash Write-offs [2]       (0.6)
Ending Balance $ 0.5 $ 0.2 $ 0.5 $ 0.2
[1] Cash expenditures primarily relate to severance charges.
[2] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions.