XML 49 R38.htm IDEA: XBRL DOCUMENT v3.10.0.1

Net Sales (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Customer Advances, Current	$ 0.8	$ 0.8
Recognized Revenue in the Current Period From Funds Collected in Advance from Customers in Earlier Period		3.2
Change in Net Sales Related To Adjustments To Rebates Or Business Development Fund Recognized in Revenue in a Prior Period	0.8	2.0
Customer Rebates, Current	20.9	20.9
Business Development Fund Accrual	$ 2.1	$ 2.1

X

- Definition

Accrual related to business development funds as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	neu_BusinessDevelopmentFundAccrual
Namespace Prefix:	neu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Change in Net Sales Related To Adjustments To Rebates Or Business Development Fund Recognized in Revenue in a Prior Period

+ References

No definition available.

+ Details

Name:	neu_ChangeinNetSalesRelatedToAdjustmentsToRebatesOrBusinessDevelopmentFundRecognizedinRevenueinaPriorPeriod
Namespace Prefix:	neu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Total of the carrying values as of the balance sheet date of the provision for customer rebates.

+ References

No definition available.

+ Details

Name:	neu_CustomerRebatesCurrent
Namespace Prefix:	neu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Revenue Recognized in the current period From Funds Collected in Advance from Customers in Earlier Periods

+ References

No definition available.

+ Details

Name:	neu_RevenueRecognizedintheCurrentPeriodFromFundsCollectedinAdvancefromCustomersinEarlierPeriods
Namespace Prefix:	neu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The current portion of prepayments received from customers for goods or services to be provided in the future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CustomerAdvancesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration