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Consolidated Statements Of Operations (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interest Income, Nonoperating $ 3.9nwl_InterestIncomeNonoperating $ 2.0nwl_InterestIncomeNonoperating $ 4.3nwl_InterestIncomeNonoperating