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DERIVATIVES AND OTHER FINANCIAL INSTRUMENTS (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
May 31, 2014
Interest rate swap fair value hedges        
Derivatives qualifying as cash flow hedges deferred in other comprehensive income $ 7.4us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax $ (41.8)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax    
Beginning balance 10.4us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 3.2us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 3.2us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Derivatives qualifying as cashflow hedges reclassified to cost of products sold (effective portion) (2.4)mjn_Derivativesqualifyingascashflowhedgesreclassifiedtocostofproductssoldeffectiveportion (1.4)mjn_Derivativesqualifyingascashflowhedgesreclassifiedtocostofproductssoldeffectiveportion    
Change in deferred taxes (1.5)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 0.4us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax    
Ending balance 14.5us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 1.9us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax    
Cash flow hedge included within accumulated other comprehensive loss expected to be reclassified within the next twelve months 14.5us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths      
Foreign Exchange Contract [Member]        
Interest rate swap fair value hedges        
Derivatives qualifying as cash flow hedges deferred in other comprehensive income 8.0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
(0.3)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
   
Interest Rate Swap [Member]        
Interest rate swap fair value hedges        
Derivatives qualifying as cash flow hedges deferred in other comprehensive income     45.0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Derivative, Net Hedge Ineffectiveness Gain (Loss)     0.5us-gaap_DerivativeNetHedgeIneffectivenessGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Derivative, Amount of Hedged Item 500.0us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
     
Amortization of Deferred Hedge Gains 0.4us-gaap_AmortizationOfDeferredHedgeGains
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
     
Commodity Option [Member]        
Interest rate swap fair value hedges        
Derivatives qualifying as cash flow hedges deferred in other comprehensive income 0.8us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
  0.8us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
 
Notional Amount 3.4invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
     
Fair value hedges        
Interest rate swap fair value hedges        
Notional Amount       700.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
Fair value hedges | Interest Rate Swap [Member]        
Interest rate swap fair value hedges        
Derivative, Amount of Hedged Item 700.0us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
     
Amortization of Deferred Hedge Gains 2.7us-gaap_AmortizationOfDeferredHedgeGains
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
     
Cash flow hedges | Foreign Exchange Contract [Member]        
Interest rate swap fair value hedges        
Notional Amount 173.6invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
  247.9invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
 
Lower limit | Interest Rate Swap [Member]        
Interest rate swap fair value hedges        
Derivative, Forward Interest Rate     3.79%us-gaap_DerivativeForwardInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Upper limit | Interest Rate Swap [Member]        
Interest rate swap fair value hedges        
Derivative, Forward Interest Rate     3.94%us-gaap_DerivativeForwardInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
4.90% Notes due 2019 | Fair value hedges | 4.60% Notes due 2044        
Interest rate swap fair value hedges        
Notional Amount       $ 700.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= mjn_Mjn_Notes460PercentDue2044Domain
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_LongtermDebtTypeAxis
= mjn_Notes490PercentDue2019Member