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Restructuring Costs (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 27 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Number of Business Segments 5nwl_NumberOfBusinessSegments        
Restructuring Costs $ (52.8)us-gaap_RestructuringCharges $ (110.3)us-gaap_RestructuringCharges $ (52.9)us-gaap_RestructuringCharges    
Cash paid for restructuring activities 71.8us-gaap_PaymentsForRestructuring 74.9us-gaap_PaymentsForRestructuring 48.6us-gaap_PaymentsForRestructuring    
Project Renewal [Member]          
Number of Global Business Units in 2011       13  
Expected completion year Dec. 31, 2017        
Project Renewal Expansion [Member]          
Expected cumulative restructuring charges 200.0us-gaap_RestructuringAndRelatedCostExpectedCost1
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalExpansionMember
       
Project Renewal [Member]          
Restructuring Costs (53.8)us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
(113.7)us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
(37.3)us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
  (236.0)us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
Project Renewal [Member] | Facility Exit Costs and Other [Member]          
Restructuring Costs (7.5)us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_FacilityExitCostsAndOtherMember
(5.7)us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_FacilityExitCostsAndOtherMember
0.7us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_FacilityExitCostsAndOtherMember
  (20.9)us-gaap_RestructuringCharges
/ nwl_RestructuringByPlanAxis
= nwl_ProjectRenewalMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_FacilityExitCostsAndOtherMember
Minimum [Member] | Renewal Combined [Member]          
Expected cumulative restructuring charges 540.0us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_RenewalCombinedMember
       
Cash expected to be paid for restructuring 510nwl_RestructuringAndRestructuringRelatedCostExpectedCashCost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_RenewalCombinedMember
       
Percentage of total project costs expected to be restructuring costs 65.00%nwl_Percentageoftotalprojectcostsexpectedtoberestructuringcosts
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_RenewalCombinedMember
       
Minimum [Member] | Project Renewal Expansion [Member]          
Restructuring, expected cost 75nwl_Restructuringexpectedcost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringPlanAxis
= nwl_ProjectRenewalExpansionMember
       
Maximum [Member] | Renewal Combined [Member]          
Expected cumulative restructuring charges 575.0us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_RenewalCombinedMember
       
Cash expected to be paid for restructuring 540nwl_RestructuringAndRestructuringRelatedCostExpectedCashCost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_RenewalCombinedMember
       
Percentage of total project costs expected to be restructuring costs 75.00%nwl_Percentageoftotalprojectcostsexpectedtoberestructuringcosts
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringCostAndReserveAxis
= nwl_RenewalCombinedMember
       
Maximum [Member] | Project Renewal Expansion [Member]          
Restructuring, expected cost $ 125nwl_Restructuringexpectedcost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringPlanAxis
= nwl_ProjectRenewalExpansionMember