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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 10.5 $ 5.8  
Provision 14.7 24.1 $ 8.3
Cash Expenditures [1] (18.0) (18.7)  
Non-Cash Write-offs (0.4) (0.7)  
Ending Balance 6.8 10.5 5.8
Workforce Reduction Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 9.9 5.0  
Provision 13.5 21.4  
Cash Expenditures [1] (16.6) (16.3)  
Non-Cash Write-offs (0.1) (0.2)  
Ending Balance 6.7 9.9 5.0
Other [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0.6 0.8  
Provision 1.2 2.7  
Cash Expenditures [1] (1.4) (2.4)  
Non-Cash Write-offs (0.3) (0.5)  
Ending Balance $ 0.1 $ 0.6 $ 0.8
[1] Cash expenditures primarily related to severance charges.