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GOODWILL (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Details of goodwill    
Goodwill at the beginning of the period $ 162.7us-gaap_Goodwill $ 196.8us-gaap_Goodwill
Translation adjustments (3.4)us-gaap_GoodwillTranslationAdjustments (20.8)us-gaap_GoodwillTranslationAdjustments
Goodwill at the end of the period 159.3us-gaap_Goodwill 176.0us-gaap_Goodwill
Goodwill, Impaired, Accumulated Impairment Loss 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss  
North America/Europe    
Details of goodwill    
Goodwill at the beginning of the period 19.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mjn_NorthAmericaEuropeMember
19.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mjn_NorthAmericaEuropeMember
Translation adjustments 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mjn_NorthAmericaEuropeMember
0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mjn_NorthAmericaEuropeMember
Goodwill at the end of the period 19.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mjn_NorthAmericaEuropeMember
19.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mjn_NorthAmericaEuropeMember
Asia [Member]    
Details of goodwill    
Goodwill at the beginning of the period 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AsiaMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AsiaMember
Translation adjustments 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AsiaMember
0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AsiaMember
Goodwill at the end of the period 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AsiaMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AsiaMember
Latin America [Member]    
Details of goodwill    
Goodwill at the beginning of the period 143.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
177.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
Translation adjustments (3.4)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
(20.8)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
Goodwill at the end of the period $ 140.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
$ 157.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember