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VENEZUELA CURRENCY MATTERS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Venezuela Currency Matters [Line Items]    
Foreign exchange (gains)/losses-net $ (2.8)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 6.4us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign exchange (gains)/losses-net 1.8us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementGeographicalAxis
= country_VE
2.1us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementGeographicalAxis
= country_VE
% of Total Net Sales 2.00%mjn_OfTotalNetSales
/ us-gaap_StatementGeographicalAxis
= country_VE
 
Net monetary assets 36mjn_Netmonetaryassets
/ us-gaap_StatementGeographicalAxis
= country_VE
 
Venezuelan bolívar fuerte | CENCOEX [Member] | VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign Currency Exchange Rate, Translation 6.3us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_VEF
/ mjn_ExchangeRateAxis
= mjn_CENCOEXMember
/ us-gaap_StatementGeographicalAxis
= country_VE
 
Venezuelan bolívar fuerte | SICAD I [Member] | VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign Currency Exchange Rate, Translation 12.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_VEF
/ mjn_ExchangeRateAxis
= mjn_SICADIMember
/ us-gaap_StatementGeographicalAxis
= country_VE
 
Venezuelan bolívar fuerte | SIMADI [Member] | VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign Currency Exchange Rate, Translation 193.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_VEF
/ mjn_ExchangeRateAxis
= mjn_SIMADIMember
/ us-gaap_StatementGeographicalAxis
= country_VE
 
United States of America, Dollars | CENCOEX [Member] | VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign Currency Exchange Rate, Translation 1.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_USD
/ mjn_ExchangeRateAxis
= mjn_CENCOEXMember
/ us-gaap_StatementGeographicalAxis
= country_VE
 
United States of America, Dollars | SICAD I [Member] | VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign Currency Exchange Rate, Translation 1.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_USD
/ mjn_ExchangeRateAxis
= mjn_SICADIMember
/ us-gaap_StatementGeographicalAxis
= country_VE
 
United States of America, Dollars | SIMADI [Member] | VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign Currency Exchange Rate, Translation 1.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_USD
/ mjn_ExchangeRateAxis
= mjn_SIMADIMember
/ us-gaap_StatementGeographicalAxis
= country_VE
 
Change in Accounting Method Accounted for as Change in Estimate [Member] | VENEZUELA    
Venezuela Currency Matters [Line Items]    
Foreign exchange (gains)/losses-net   $ 6.1us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ChangeInAccountingMethodAccountedForAsChangeInEstimateMember
/ us-gaap_StatementGeographicalAxis
= country_VE