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CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (USD $)
In Millions, unless otherwise specified
Total
Common Stock
Additional Paid-in (Distributed) Capital
Retained Earnings
Comprehensive Income [Member]
Treasury Stock
Accumulated Other Comprehensive Loss
Noncontrolling Interests
Parent [Member]
Redeemable Noncontrolling Interest, BALANCE at Dec. 31, 2013 $ 49.7us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                
BALANCE at Dec. 31, 2013 300.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(721.5)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
1,432.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (351.9)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(69.2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
8.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Increase (Decrease) in Stockholders' Equity                  
Stock-based Compensation Awards 11.2us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation   18.9us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    (7.7)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Treasury Stock Acquired (22.5)us-gaap_TreasuryStockValueAcquiredCostMethod         (22.5)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Cash Dividends Declared (76.0)us-gaap_DividendsCommonStock     (76.0)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Net Earnings 207.4mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests     202.4mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
      5.0mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Redeemable Noncontrolling Interest Accretion (8.8)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion     (8.8)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Other Comprehensive Income (Loss) (58.2)us-gaap_OtherComprehensiveIncomeLossNetOfTax           (52.2)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(0.3)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(52.5)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Increase (Decrease) in Temporary Equity                  
Net earnings of redeemable noncontrolling interest         0.4us-gaap_TemporaryEquityNetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
       
Redeemable Noncontrolling Interest Accretion         8.8mjn_RedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
       
Other Comprehensive Loss         (5.7)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
       
Redeemable Noncontrolling Interest, BALANCE at Mar. 31, 2014 53.2us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                
BALANCE at Mar. 31, 2014 359.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(702.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
1,549.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (382.1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(121.4)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
13.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Redeemable Noncontrolling Interest, BALANCE at Dec. 31, 2014 66.0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                
BALANCE at Dec. 31, 2014 583.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(641.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
1,775.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (362.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(198.9)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
9.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Increase (Decrease) in Stockholders' Equity                  
Stock-based Compensation Awards 8.6us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation   15.8us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(7.2)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Treasury Stock Acquired 0us-gaap_TreasuryStockValueAcquiredCostMethod         0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
     
Cash Dividends Declared (83.8)us-gaap_DividendsCommonStock     (83.8)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Net Earnings 206.8mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests     207.4mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
      (0.6)mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Redeemable Noncontrolling Interest Accretion (6.1)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion     (6.1)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Other Comprehensive Income (Loss) (33.5)us-gaap_OtherComprehensiveIncomeLossNetOfTax           (32.9)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(32.9)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Increase (Decrease) in Temporary Equity                  
Net earnings of redeemable noncontrolling interest         0.3us-gaap_TemporaryEquityNetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
       
Redeemable Noncontrolling Interest Accretion         6.1mjn_RedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
       
Other Comprehensive Loss         (0.6)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
       
Redeemable Noncontrolling Interest, BALANCE at Mar. 31, 2015 71.8us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                
BALANCE at Mar. 31, 2015 $ 676.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 2.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (625.5)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 1,885.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  $ (362.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ (231.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 8.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember