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DERIVATIVES AND OTHER FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 31, 2011
Nov. 30, 2009
Nov. 30, 2010
Derivative disclosures            
No transfers between levels in fair value hierarchy $ 0mjn_Notransfersbetweenlevelsinfairvaluehierarchy          
Derivative Asset, Fair Value, Gross Asset 12.8us-gaap_DerivativeFairValueOfDerivativeAsset          
Net asset/(liability) of derivatives designated as hedging instruments 11.1us-gaap_DerivativeFairValueOfDerivativeNet 23.6us-gaap_DerivativeFairValueOfDerivativeNet        
Notional value 247.9invest_DerivativeNotionalAmount          
Deferred Gains/(Losses) on Derivatives Qualifying as Hedges for the Period (52.9)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax 24.2us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax (12.7)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax      
Foreign Exchange Contracts            
Derivative disclosures            
Deferred Gains/(Losses) on Derivatives Qualifying as Hedges for the Period 12.1us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
4.8us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
       
Commodity Option [Member]            
Derivative disclosures            
Notional value 5.3invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
         
Deferred Gains/(Losses) on Derivatives Qualifying as Hedges for the Period 0.8us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
         
Interest Rate Swaps            
Derivative disclosures            
Amortization of Deferred Hedge Gains 0.9us-gaap_AmortizationOfDeferredHedgeGains
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
         
Derivative, Amount of Hedged Item 500.0us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
         
Deferred Gains/(Losses) on Derivatives Qualifying as Hedges for the Period 45.0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
         
Cash flow hedges            
Derivative disclosures            
Number of days from originally forecasted transaction date to discontinue cash flow hedge accounting 60mjn_MaximumPeriodForDiscontinuationOfForeignCurrencyCashFlowHedgeDueToForecastedTransactionIsProbableOfNotOccurring
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
         
Cash flow hedges | Foreign Currency Forward Contract            
Derivative disclosures            
Maximum duration of foreign exchange contracts used to hedge intercompany purchases (in months) 1 year 6 months          
Cash flow hedges | Commodity Option [Member] | Other assets            
Derivative disclosures            
Derivative Asset, Fair Value, Gross Asset 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
       
Cash flow hedges | Commodity Option [Member] | Accrued expenses            
Derivative disclosures            
Cash flow hedges (0.8)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
       
Cash flow hedges | Interest Rate Swaps | Other assets            
Derivative disclosures            
Derivative Asset, Fair Value, Gross Asset 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
19.9us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
       
Cash flow hedges | Interest Rate Swaps | Other Liabilities [Member]            
Derivative disclosures            
Cash flow hedges (0.9)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
       
Fair value hedges | Interest Rate Swaps            
Derivative disclosures            
Amortization of Deferred Hedge Gains 6.0us-gaap_AmortizationOfDeferredHedgeGains
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
         
Derivative, Amount of Hedged Item         700.0us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
 
Terminated contracts | Fair value hedges | Interest Rate Swaps            
Derivative disclosures            
Amortization of Deferred Hedge Gains 1.9us-gaap_AmortizationOfDeferredHedgeGains
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= mjn_TerminatedContractMember
    1.6us-gaap_AmortizationOfDeferredHedgeGains
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= mjn_TerminatedContractMember
   
Notional value       500.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= mjn_TerminatedContractMember
  200.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= mjn_TerminatedContractMember
Designated as hedging instruments | Cash flow hedges | Other assets            
Derivative disclosures            
Derivative Asset, Fair Value, Gross Asset 13.0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
4.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Designated as hedging instruments | Cash flow hedges | Accrued expenses            
Derivative disclosures            
Cash flow hedges (0.2)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
(0.5)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
       
Lower limit | Interest Rate Swaps            
Derivative disclosures            
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 Swaps            
Derivative disclosures            
Derivative, Forward Interest Rate 3.94%us-gaap_DerivativeForwardInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Canada, Dollars            
Derivative disclosures            
Derivative Asset, Fair Value, Gross Asset 1.6us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CurrencyAxis
= currency_CAD
         
Weighted average Forward Rate (in foreign currency) 1.12us-gaap_DerivativeAverageForwardExchangeRate1
/ us-gaap_CurrencyAxis
= currency_CAD
         
Notional value 39.7invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_CAD
         
Derivative, Maturity Date Dec. 31, 2015          
Mexican peso            
Derivative disclosures            
Derivative Asset, Fair Value, Gross Asset 8.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CurrencyAxis
= currency_MXN
         
Weighted average Forward Rate (in foreign currency) 13.54us-gaap_DerivativeAverageForwardExchangeRate1
/ us-gaap_CurrencyAxis
= currency_MXN
         
Notional value 91.8invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_MXN
         
Derivative, Maturity Date Dec. 31, 2015          
Malaysia, Ringgits            
Derivative disclosures            
Derivative Asset, Fair Value, Gross Asset 2.9us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CurrencyAxis
= currency_MYR
         
Weighted average Forward Rate (in foreign currency) 3.38us-gaap_DerivativeAverageForwardExchangeRate1
/ us-gaap_CurrencyAxis
= currency_MYR
         
Notional value 63.5invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_MYR
         
Derivative, Maturity Date Dec. 31, 2015          
Philippine peso            
Derivative disclosures            
Derivative Asset, Fair Value, Gross Asset 0.1us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CurrencyAxis
= currency_PHP
         
Weighted average Forward Rate (in foreign currency) 44.84us-gaap_DerivativeAverageForwardExchangeRate1
/ us-gaap_CurrencyAxis
= currency_PHP
         
Notional value $ 52.9invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_PHP
         
Derivative, Maturity Date Dec. 31, 2015