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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 5.8 $ 3.0  
Provision 24.1 8.3 $ 13.9 [1]
Cash Expenditures [2] (18.7) (5.2)  
Non-Cash Write-offs [3] (0.7) (0.3)  
Ending Balance 10.5 5.8 3.0
Workforce Reduction Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 5.0 2.4  
Provision 21.4 6.7  
Cash Expenditures [2] (16.3) (3.9)  
Non-Cash Write-offs [3] (0.2) (0.2)  
Ending Balance 9.9 5.0 2.4
Other [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0.8 0.6  
Provision 2.7 1.6  
Cash Expenditures [2] (2.4) (1.3)  
Non-Cash Write-offs [3] (0.5) (0.1)  
Ending Balance $ 0.6 $ 0.8 $ 0.6
[1] “Other Charges” represent charges or gains directly related to restructuring initiatives that cannot be reported as restructuring under GAAP. Such charges or gains may include losses on disposal of inventories, trade receivables allowances from exiting product lines, accelerated depreciation resulting from the closure of facilities, and gains and losses on the sale of previously closed facilities.
[2] Cash expenditures primarily related to severance charges.
[3] Non-cash write-offs include long-lived asset impairment charges attributable to restructuring actions.