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Derivatives (Schedule Of Cash Flow Hedges) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (5.5)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet $ (3.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet $ (3.2)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 14.9us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet 4.6us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet (9.2)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Intercompany Foreign Currency Derivatives, Cash (Paid) Received At Settlement 3.1nwl_IntercompanyForeignCurrencyDerivativesCashReceivedOrPaidAtSettlement (1.6)nwl_IntercompanyForeignCurrencyDerivativesCashReceivedOrPaidAtSettlement (0.5)nwl_IntercompanyForeignCurrencyDerivativesCashReceivedOrPaidAtSettlement
Cash Flow Hedge Ineffectiveness is Immaterial not material    
Foreign Exchange Contract on Inventory-Related Purchases [Member]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 11.6us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignExchangeContractMember
5.2us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignExchangeContractMember
(1.7)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignExchangeContractMember
Foreign Exchange Contracts on Intercompany Borrowings [Member]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 3.3us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForeignExchangeContractsOnIntercompanyBorrowingsMember
(0.6)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForeignExchangeContractsOnIntercompanyBorrowingsMember
(2.1)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForeignExchangeContractsOnIntercompanyBorrowingsMember
Forward Interest Rate Swaps [Member]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForwardInterestRateSwapsMember
0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForwardInterestRateSwapsMember
(2.5)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForwardInterestRateSwapsMember
Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommodityContractMember
0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommodityContractMember
(2.9)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommodityContractMember
Cost of Products Sold [Member] | Foreign Exchange Contract on Inventory-Related Purchases [Member]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 5.9us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignExchangeContractMember
3.8us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignExchangeContractMember
(0.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignExchangeContractMember
Cost of Products Sold [Member] | Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommodityContractMember
0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommodityContractMember
(2.9)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommodityContractMember
Interest Expense, Net [Member] | Foreign Exchange Contracts on Intercompany Borrowings [Member]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0.3us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForeignExchangeContractsOnIntercompanyBorrowingsMember
0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForeignExchangeContractsOnIntercompanyBorrowingsMember
(0.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForeignExchangeContractsOnIntercompanyBorrowingsMember
Interest Expense, Net [Member] | Forward Interest Rate Swaps [Member]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (0.7)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForwardInterestRateSwapsMember
(0.7)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForwardInterestRateSwapsMember
(0.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nwl_ForwardInterestRateSwapsMember
Forward Interest Rate Swaps [Member]      
Derivative Asset, Notional Amount 400.0us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= nwl_ForwardInterestRateSwapsMember
  250.0us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= nwl_ForwardInterestRateSwapsMember
Derivative, Fixed Interest Rate     1.80%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= nwl_ForwardInterestRateSwapsMember
Derivative, Maturity Date     Mar. 15, 2013
Commodity Contract [Member]      
Derivative Asset, Notional Amount     $ 14.0us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityContractMember