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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 6.8 $ 10.5
Provision $ 1.6 $ 5.5 16.5 11.2
Cash Expenditures [1]     (12.8) (11.3)
Non-Cash Write-offs       (0.1)
Ending Balance 10.5 10.3 10.5 10.3
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     6.7 9.9
Provision     16.0 10.2
Cash Expenditures [1]     (12.2) (10.1)
Non-Cash Write-offs       (0.1)
Ending Balance $ 10.5 9.9 10.5 9.9
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.1 0.6
Provision     0.5 1.0
Cash Expenditures [1]     $ (0.6) (1.2)
Ending Balance   $ 0.4   $ 0.4
[1] Cash expenditures primarily relate to severance charges.