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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 10.5 $ 5.8
Provision $ 5.5 $ 5.7 11.2 17.3
Cash Expenditures [1]     (11.3) (12.5)
Non-Cash Write-offs     (0.1) (0.6) [2]
Ending Balance 10.3 10.0 10.3 10.0
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     9.9 5.0
Provision     10.2 16.0
Cash Expenditures [1]     (10.1) (11.3)
Non-Cash Write-offs     (0.1)  
Ending Balance 9.9 9.7 9.9 9.7
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.6 0.8
Provision     1.0 1.3
Cash Expenditures [1]     (1.2) (1.2)
Non-Cash Write-offs [2]       (0.6)
Ending Balance $ 0.4 $ 0.3 $ 0.4 $ 0.3
[1] Cash expenditures primarily relate to severance charges.
[2] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions.