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Goodwill and Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Gross Amount  
Balance at the beginning of the period $ 101.8us-gaap_GoodwillGross
Foreign currency translation (9.4)np_ForeignCurrencyTranslationRelatedToGrossGoodwill
Balance at the end of the period 92.4us-gaap_GoodwillGross
Cumulative Impairment Losses  
Balance at the beginning of the period (50.3)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Foreign currency translation 5.4np_ForeignCurrencyTranslationRelatedToGoodwillImpairedAccumulatedImpairmentLoss
Balance at the end of the period (44.9)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Net  
Balance at the beginning of the period 51.5us-gaap_Goodwill
Foreign currency translation (4.0)us-gaap_GoodwillTranslationAdjustments
Balance at the end of the period $ 47.5us-gaap_Goodwill