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Derivatives (Cash Flow Hedges Reclassified From AOCI) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Amount of Gain (Loss) Reclassified from AOCI to Income $ 4.1us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet $ 1.7us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Foreign Exchange Contract on Inventory-Related Purchases [Member] | Cost of Products Sold [Member]    
Amount of Gain (Loss) Reclassified from AOCI to Income 4.3us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 1.9us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Forward Interest Rate Swaps [Member] | Interest Expense, Net [Member]    
Amount of Gain (Loss) Reclassified from AOCI to Income $ (0.2)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeByNatureAxis
= nwl_ForwardInterestRateSwapsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 $ (0.2)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeByNatureAxis
= nwl_ForwardInterestRateSwapsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember