2.2.0.25truefalse40501 - Disclosure - Segment Information (Segment Earnings) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Duration_1_1_2011_To_3_31_2011http://www.sec.gov/CIK0001452575duration2011-01-01T00:00:002011-03-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2010 - 3/31/2010 USD ($) USD ($) / shares $Duration_1_1_2010_To_3_31_2010http://www.sec.gov/CIK0001452575duration2010-01-01T00:00:002010-03-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2false0us-gaap_SalesRevenueGoodsNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse899800000899.8falsetruefalsefalsefalse2truefalsefalse763500000763.5falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 falsefalseNet Sales3false0mjn_SegmentReportingInformationEarningsBeforeInterestAndIncomeTaxesmjnfalsecreditdurationSegment reporting information earnings before interest and income taxesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse309700000309.7falsefalsefalsefalsefalse2truefalsefalse263400000263.4falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySegment reporting information earnings before interest and income taxesNo authoritative reference available.falsefalseTotal operating segments, earnings before interest and income taxes4false0mjn_EarningsBeforeInterestAndIncomeTaxesmjnfalsecreditdurationEarnings before interest and income taxes, including operating and non-operating items.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse222600000222.6falsefalsefalsefalsefalse2truefalsefalse197900000197.9falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEarnings before interest and income taxes, including operating and non-operating items.No authoritative reference available.falsefalseEarnings Before Interest and Income Taxes5false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.mjn.com/role/disclosuresegmentinformationsegmentearningsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Asia/Latin America [Member] 1/1/2011 - 3/31/2011 USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_SegmentReportingInformationBySegmentAxis_mjn_AsiaLatinAmericaMemberhttp://www.sec.gov/CIK0001452575duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseAsia/Latin America [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldimjn_AsiaLatinAmericaMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Asia/Latin America [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_SegmentReportingInformationBySegmentAxis_mjn_AsiaLatinAmericaMemberhttp://www.sec.gov/CIK0001452575duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseAsia/Latin America [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldimjn_AsiaLatinAmericaMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseAsia/Latin America [Member]6false0us-gaap_SalesRevenueGoodsNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse576900000576.9falsefalsefalsefalsefalse2truefalsefalse456000000456.0falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 falsefalseNet Sales7false0mjn_EarningsBeforeInterestAndIncomeTaxesmjnfalsecreditdurationEarnings before interest and income taxes, including operating and non-operating items.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse216800000216.8falsefalsefalsefalsefalse2truefalsefalse166300000166.3falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEarnings before interest and income taxes, including operating and non-operating items.No authoritative reference available.falsefalseEarnings Before Interest and Income Taxes8false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.mjn.com/role/disclosuresegmentinformationsegmentearningsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : North America/Europe [Member] 1/1/2011 - 3/31/2011 USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_SegmentReportingInformationBySegmentAxis_mjn_NorthAmericaEuropeMemberhttp://www.sec.gov/CIK0001452575duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseNorth America/Europe [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldimjn_NorthAmericaEuropeMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : North America/Europe [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_SegmentReportingInformationBySegmentAxis_mjn_NorthAmericaEuropeMemberhttp://www.sec.gov/CIK0001452575duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseNorth America/Europe [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldimjn_NorthAmericaEuropeMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseNorth America/Europe [Member]9false0us-gaap_SalesRevenueGoodsNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse322900000322.9falsefalsefalsefalsefalse2truefalsefalse307500000307.5falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 falsefalseNet Sales10false0mjn_EarningsBeforeInterestAndIncomeTaxesmjnfalsecreditdurationEarnings before interest and income taxes, including operating and non-operating items.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse9290000092.9falsefalsefalsefalsefalse2truefalsefalse9710000097.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEarnings before interest and income taxes, including operating and non-operating items.No authoritative reference available.falsefalseEarnings Before Interest and Income Taxes11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.mjn.com/role/disclosuresegmentinformationsegmentearningsdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate and Other [Member] 1/1/2011 - 3/31/2011 USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_SegmentReportingInformationBySegmentAxis_mjn_CorporateAndOtherMemberhttp://www.sec.gov/CIK0001452575duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseCorporate and Other [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldimjn_CorporateAndOtherMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_SegmentReportingInformationBySegmentAxis} : Corporate and Other [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_SegmentReportingInformationBySegmentAxis_mjn_CorporateAndOtherMemberhttp://www.sec.gov/CIK0001452575duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseCorporate and Other [Member]us-gaap_SegmentReportingInformationBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldimjn_CorporateAndOtherMemberus-gaap_SegmentReportingInformationBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCorporate and Other [Member]12false0us-gaap_SalesRevenueGoodsNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00 falsefalsefalsefalsefalse2falsefalsefalse00 falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 falsefalseNet Sales13false0mjn_EarningsBeforeInterestAndIncomeTaxesmjnfalsecreditdurationEarnings before interest and income taxes, including operating and non-operating items.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-87100000-87.1falsetruefalsefalsefalse2truefalsefalse-65500000-65.5falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryEarnings before interest and income taxes, including operating and non-operating items.No authoritative reference available.falsefalseEarnings Before Interest and Income Taxes212Segment Information (Segment Earnings) (Details) (USD $)HundredThousandsUnKnownUnKnownUnKnownfalsetrue