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Debt (Receivables-Related Borrowings) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Receivables facility $ 250.0nwl_ReceivablesFacility $ 350.0nwl_ReceivablesFacility
Receivables Facility [Member]    
Maximum borrowing capacity 350.0nwl_ReceivablesFinancingFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= nwl_ReceivablesFacilityMember		  
Debt Instrument, Maturity Date Sep. 01, 2015  
Accounts receivable as collateral for receivables facility $ 685.6nwl_ReceivablesFacilityCollateralAtPeriodEndValue
/ us-gaap_LineOfCreditFacilityAxis
= nwl_ReceivablesFacilityMember