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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

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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