XML 97 R81.htm IDEA: XBRL DOCUMENT
v3.20.4

Leases Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020
Lessee, Lease, Description [Line Items] |  |
Operating Leases, Rent Expense, Net | $ 23 |
Lessee Operating Lease Option to Extend Reasonably Certain |  | $ 16
Lease commitments that have not yet commenced |  | 25
Leases not yet commenced that will provide right-of-use assets |  | $ 38
Minimum [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Remaining Lease Term |  | 1 year
Lessee, Finance Lease, Remaining Lease Term |  | 1 year
Maximum [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, Operating Lease, Remaining Lease Term |  | 50 years
Lessee, Finance Lease, Remaining Lease Term |  | 50 years

X
- Definition Leases not yet commenced that will provide future ROU + References No definition available. + Details
Name: | neu_LeasesNotYetCommencedThatWillProvideRightOfUseAssets
Namespace Prefix: | neu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, Lease Not Yet Commenced, Payments, Due + References No definition available. + Details
Name: | neu_LesseeLeaseNotYetCommencedPaymentsDue
Namespace Prefix: | neu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount related to options to extend lease terms that are reasonably certain of being exercised. + References No definition available. + Details
Name: | neu_LesseeOperatingLeaseOptiontoExtendReasonablyCertain
Namespace Prefix: | neu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Remaining lease term of finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeFinanceLeaseRemainingLeaseTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |