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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 6.8 $ 10.5
Provision $ 10.4 $ 4.5 14.9 5.7
Cash Expenditures [1]     (7.6) (6.6)
Non-Cash Write-offs       (0.1)
Ending Balance 14.1 9.5 14.1 9.5
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     6.7 9.9
Provision     14.5 4.9
Cash Expenditures [1]     (7.2) (5.7)
Non-Cash Write-offs       (0.1)
Ending Balance 14.0 9.0 14.0 9.0
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.1 0.6
Provision     0.4 0.8
Cash Expenditures [1]     (0.4) (0.9)
Ending Balance $ 0.1 $ 0.5 $ 0.1 $ 0.5
[1] Cash expenditures primarily relate to severance charges.