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Supplemental Balance Sheet Data (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Changes in accumulated other comprehensive income    
AOCI, Balance at the beginning of the period $ (68.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Other comprehensive income before reclassifications (13.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax  
Amounts reclassified from AOCI 1.8us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax  
Income (loss) from other comprehensive income items (11.6)us-gaap_OtherComprehensiveIncomeLossBeforeTax 1.1us-gaap_OtherComprehensiveIncomeLossBeforeTax
Provision for income taxes 0.6us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 0.4us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive income (loss) (12.2)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 0.7us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
AOCI, Balance at the end of the period (80.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Income tax benefit (9.5)us-gaap_IncomeTaxExpenseBenefit (7.0)us-gaap_IncomeTaxExpenseBenefit
Amount Reclassified from Accumulated Other Comprehensive Income    
Changes in accumulated other comprehensive income    
Cost of products sold and selling, general and administrative expenses 1.8np_CostOfGoodsSoldAndSellingGeneralAndAdministrativeExpenses
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
 
Income tax benefit 0.6us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
 
Unrealized foreign currency translation gain    
Changes in accumulated other comprehensive income    
AOCI, Balance at the beginning of the period (5.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
 
Other comprehensive income before reclassifications (13.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
 
Income (loss) from other comprehensive income items (13.4)us-gaap_OtherComprehensiveIncomeLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
 
Other comprehensive income (loss) (13.4)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
 
AOCI, Balance at the end of the period (19.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
 
Net gain (loss) from pension and other postretirement liabilities    
Changes in accumulated other comprehensive income    
AOCI, Balance at the beginning of the period (62.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
 
Amounts reclassified from AOCI 1.8us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
 
Income (loss) from other comprehensive income items 1.8us-gaap_OtherComprehensiveIncomeLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
 
Provision for income taxes 0.6us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
 
Other comprehensive income (loss) 1.2us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
 
AOCI, Balance at the end of the period $ (61.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember