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Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 7.6 $ 6.8
Provision $ 0.3 $ 10.4 7.9 14.9
Cash Expenditures [1]     (8.8) (7.6)
Ending Balance 6.7 14.1 6.7 14.1
Workforce Reduction Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     6.9 6.7
Provision     6.4 14.5
Cash Expenditures [1]     (7.9) (7.2)
Ending Balance 5.4 14.0 5.4 14.0
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     0.7 0.1
Provision     1.5 0.4
Cash Expenditures [1]     (0.9) (0.4)
Ending Balance $ 1.3 $ 0.1 $ 1.3 $ 0.1
[1] Cash expenditures primarily relate to severance charges.