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Fair Value Disclosures (Fair Value Of Certain Short And Long-term Debt, Based On Market Prices) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Medium Term Notes at Fair Value $ 2,154.4nwl_MediumTermNotesAtFairValue $ 1,753.0nwl_MediumTermNotesAtFairValue
Medium-term notes at Book Value $ 2,089.5us-gaap_MediumTermNotes $ 1,659.8us-gaap_MediumTermNotes