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Debt (Summary Of Outstanding Debt) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Medium-term Notes $ 2,089.5us-gaap_MediumTermNotes $ 1,659.8us-gaap_MediumTermNotes
Commercial Paper 28.0us-gaap_CommercialPaper 95.0us-gaap_CommercialPaper
Receivables facility 350.0nwl_ReceivablesFacility 75.0nwl_ReceivablesFacility
Other debt 14.4us-gaap_OtherLongTermDebt 6.6us-gaap_OtherLongTermDebt
Total debt 2,481.9us-gaap_LongTermDebt 1,836.4us-gaap_LongTermDebt
Short-term debt (390.7)us-gaap_ShortTermBorrowings (174.0)us-gaap_ShortTermBorrowings
Current portion of long-term debt (6.7)us-gaap_LongTermDebtCurrent (0.8)us-gaap_LongTermDebtCurrent
Long-term debt 2,084.5us-gaap_LongTermDebtNoncurrent 1,661.6us-gaap_LongTermDebtNoncurrent
Long-term Debt, Maturities, Repayments of Principal in Year One 397.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
Long-term Debt, Maturities, Repayments of Principal in Year Two 5.7us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
Long-term Debt, Maturities, Repayments of Principal in Year Three 355.6us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
Long-term Debt, Maturities, Repayments of Principal in Year Four 251.6us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Long-term Debt, Maturities, Repayments of Principal in Year Five 350.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,121.6us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Short-term Debt, Average Outstanding Amount $ 114.4us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
$ 122.4us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
Short-term Debt, Weighted Average Interest Rate 2.70%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
2.90%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember