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Restructuring Costs - Schedule of Accrued Restructuring Costs Activity (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Restructuring and Related Activities [Abstract] |  |
Non-cash restructuring charges | $ 22.2 | $ 10.3

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- Definition Non-cash portion of amounts charged against earnings in the period for incurred and estimated costs associated with exits from business activities, disposals of assets, and restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. + References No definition available. + Details
Name: | nwl_NonCashPortionOfRestructuringChargesNet
Namespace Prefix: | nwl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration