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OTHER INTANGIBLE ASSETS (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other intangible assets    
Total $ 30.2us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill $ 31.1us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Indefinite-lived intangible assets zero amortization 0mjn_Indefinitelivedintangibleassetszeroamortization 0mjn_Indefinitelivedintangibleassetszeroamortization
Amortizable intangible assets    
Gross Carrying Amount 133.8us-gaap_FiniteLivedIntangibleAssetsGross 132.8us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (92.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (88.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Book Value 41.5us-gaap_FiniteLivedIntangibleAssetsNet 44.3us-gaap_FiniteLivedIntangibleAssetsNet
Total other intangible assets, Gross Carrying Amount 164.0us-gaap_IntangibleAssetsGrossExcludingGoodwill 163.9us-gaap_IntangibleAssetsGrossExcludingGoodwill
Total other intangible assets, Net Book Value 71.7us-gaap_IntangibleAssetsNetExcludingGoodwill 75.4us-gaap_IntangibleAssetsNetExcludingGoodwill
Computer software    
Amortizable intangible assets    
Gross Carrying Amount 131.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
130.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Accumulated Amortization (91.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
(87.8)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Net Book Value 39.8us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
42.5us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Distributor-customer relationship    
Amortizable intangible assets    
Gross Carrying Amount 2.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
2.5us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (0.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(0.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Net Book Value 1.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
1.8us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Trademark    
Other intangible assets    
Total 25.2us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
26.0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Indefinite-lived intangible assets zero amortization 0mjn_Indefinitelivedintangibleassetszeroamortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
0mjn_Indefinitelivedintangibleassetszeroamortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Non-compete agreement    
Other intangible assets    
Total 5.0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
5.1us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Indefinite-lived intangible assets zero amortization $ 0mjn_Indefinitelivedintangibleassetszeroamortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
$ 0mjn_Indefinitelivedintangibleassetszeroamortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember