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Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Leased Assets [Line Items]    
Right of use lease asset $ 27.9 $ 32.0
Financing lease assets noncurrent $ 8.0 $ 8.8
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet
Total lease assets $ 43.5 $ 47.5
Finance lease liability current $ 0.4 $ 4.0
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Operating lease liability current $ 10.5 $ 8.8
Finance lease liability Noncurrent $ 8.4 $ 8.4
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations
Operating lease liability noncurrent $ 33.6 $ 30.1
Total lease liabilities 52.9 51.3
Trade And Other Receivables Net    
Operating Leased Assets [Line Items]    
Operating lease assets current 5.4 5.5
Prepaid Expenses and Other Current Assets    
Operating Leased Assets [Line Items]    
Operating lease assets current $ 2.2 $ 1.2