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Deferred Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Deferred Income Taxes [Line Items]    
Amount of Deferred Tax Assets netted in reported in noncurrenct deferred income tax $ 31.3nwl_AmountofDeferredTaxAssetsnettedinreportedinnoncurrenctdeferredincometax  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals 144.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 137.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions 135.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 112.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 31.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 54.4us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 271.9us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 297.9us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Deferred Tax Assets, Other 100.8us-gaap_DeferredTaxAssetsOther 112.6us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 723.7us-gaap_DeferredTaxAssetsGross 760.8us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (345.3)us-gaap_DeferredTaxAssetsValuationAllowance (375.5)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net 378.4us-gaap_DeferredTaxAssetsNet 385.3us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Property, Plant and Equipment (58.3)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (59.6)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Intangible Assets (352.0)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (286.8)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred Tax Liabilities, Other (3.3)us-gaap_DeferredTaxLiabilitiesOther (5.7)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities (413.6)us-gaap_DeferredTaxLiabilities (352.1)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets (Liabilities), Net (35.2)us-gaap_DeferredTaxAssetsLiabilitiesNet 33.2us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Tax Assets, Net, Current 134.4us-gaap_DeferredTaxAssetsNetCurrent 134.4us-gaap_DeferredTaxAssetsNetCurrent
Deferred Tax Liabilities, Current (2.1)us-gaap_DeferredTaxLiabilitiesCurrent (5.2)us-gaap_DeferredTaxLiabilitiesCurrent
Deferred income taxes 21.5us-gaap_DeferredTaxAssetsNetNoncurrent 12.3us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred Tax Liability (net) noncurrent (189.0)nwl_DeferredTaxLiabilitynetnoncurrent (108.3)nwl_DeferredTaxLiabilitynetnoncurrent
Tax Credit Carryfoward, Expiration Range 2020  
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 890.0us-gaap_OperatingLossCarryforwards  
Deferred Tax Asset, Operating Loss Carryforwards, Foreign (do not expire) 783.6nwl_OperatingLossCarryforwardsnotsubjecttoexpiration  
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 106.4nwl_OperatingLossCarryforwardssubjecttoexpiration  
Operating Loss Carryforward, Expiration Date Range 2015 and 2031  
Estimated Undistributed Foreign Subsidiaries Earnings, Amount 601.8us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Valuation Allowance, Deferred Tax Asset, Change in Amount 30.2us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Valuation Allowance, Deferred Tax Asset, Explanation of Change 18.4  
Postretirement Liabilities [Member]    
Deferred Income Taxes [Line Items]    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions 39.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= nwl_PostretirementLiabilitiesMember		 45.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= nwl_PostretirementLiabilitiesMember
Balance Sheet Item [Member]    
Deferred Income Taxes [Line Items]    
Deferred Tax Assets (Liabilities), Net $ (35.2)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= nwl_BalanceSheetItemMember		 $ 33.2us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= nwl_BalanceSheetItemMember