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Fair Value Disclosures (Fair Value Of Certain Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Medium-term notes at Fair Value	$ 2,205.1nwl_MediumTermNotesAtFairValue	$ 2,154.4nwl_MediumTermNotesAtFairValue
Medium-term notes at Book Value	$ 2,099.3us-gaap_MediumTermNotes	$ 2,089.5us-gaap_MediumTermNotes

Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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