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VENEZUELA CURRENCY MATTERS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 26, 2015
Rate
Venezuela Currency Matters [Line Items]        
Foreign Currency Transaction Gain (Loss), before Tax $ (0.5)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ (9.3)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 3.1us-gaap_ForeignCurrencyTransactionGainLossBeforeTax  
VENEZUELA        
Venezuela Currency Matters [Line Items]        
% of Total Net Sales 2.00%mjn_OfTotalNetSales
/ us-gaap_StatementGeographicalAxis
= country_VE
2.00%mjn_OfTotalNetSales
/ us-gaap_StatementGeographicalAxis
= country_VE
   
Foreign Currency Transaction Gain (Loss), before Tax (14.0)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementGeographicalAxis
= country_VE
     
Net monetary assets $ 22mjn_Netmonetaryassets
/ us-gaap_StatementGeographicalAxis
= country_VE
     
CENCOEX [Member] | Venezuelan bolívar fuerte | 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
     
CENCOEX [Member] | United States of America, Dollars | 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
     
SICAD I [Member] | Venezuelan bolívar fuerte | 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
     
SICAD I [Member] | United States of America, Dollars | 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
     
SICAD II [Member] [Member] | Venezuelan bolívar fuerte | VENEZUELA        
Venezuela Currency Matters [Line Items]        
Foreign Currency Exchange Rate, Translation 50.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_VEF
/ mjn_ExchangeRateAxis
= mjn_SICADIIMemberMember
/ us-gaap_StatementGeographicalAxis
= country_VE
     
SICAD II [Member] [Member] | United States of America, Dollars | VENEZUELA        
Venezuela Currency Matters [Line Items]        
Foreign Currency Exchange Rate, Translation 1.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_USD
/ mjn_ExchangeRateAxis
= mjn_SICADIIMemberMember
/ us-gaap_StatementGeographicalAxis
= country_VE
     
Subsequent Event [Member] | CENCOEX [Member] | Venezuelan bolívar fuerte | 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
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | CENCOEX [Member] | United States of America, Dollars | 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
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | SICAD I [Member] | Venezuelan bolívar fuerte | 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
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | SICAD I [Member] | United States of America, Dollars | 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
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | SIMADI [Member] | Venezuelan bolívar fuerte | VENEZUELA        
Venezuela Currency Matters [Line Items]        
Foreign Currency Exchange Rate, Translation       170.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_VEF
/ mjn_ExchangeRateAxis
= mjn_SIMADIMember
/ us-gaap_StatementGeographicalAxis
= country_VE
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | SIMADI [Member] | United States of America, Dollars | 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
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember