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CONSOLIDATED STATEMENTS OF EQUITY/(DEFICIT) AND REDEEMABLE NONCONTROLLING INTEREST (USD $)
In Millions, unless otherwise specified
Total
Common Stock
Additional Paid-in (Distributed) Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Noncontrolling Interests
Parent [Member]
Redeemable noncontrolling Interests
Redeemable Noncontrolling Interest, BALANCE at Dec. 31, 2011 $ 0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                
BALANCE at Dec. 31, 2011 (168.0)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(824.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
721.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(89.7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
11.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
11.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Increase (Decrease) in Stockholders' Equity                  
Stock-based Compensation Awards 36.6us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation 0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
51.8us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  (15.2)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
       
Treasury Stock Acquired (139.7)us-gaap_TreasuryStockValueAcquiredCostMethod       (139.7)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
       
Distributions to Noncontrolling Interests (7.6)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders           (7.6)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Cash Dividends Declared (244.7)us-gaap_DividendsCommonStock     (244.7)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Net Earnings 587.2mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests     580.4mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    6.8mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Equity Impact of Redeemable Noncontrolling Interest Accretion (5.0)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion     (5.0)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Other Comprehensive Income/(Loss) (29.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax         (29.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(29.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Increase (Decrease) in Temporary Equity                  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 7.6us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders           7.6us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Acquisition                 30.2mjn_RedeemableNoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Net earnings of redeemable noncontrolling interest                 1.1us-gaap_TemporaryEquityNetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Redeemable Noncontrolling Interest Accretion                 5.0mjn_RedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Redeemable Noncontrolling Interest, BALANCE at Dec. 31, 2012 36.3us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                
BALANCE at Dec. 31, 2012 29.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(772.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
1,052.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(244.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(18.4)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
10.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Increase (Decrease) in Stockholders' Equity                  
Stock-based Compensation Awards 37.7us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation    56.6us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  (18.9)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
       
Treasury Stock Acquired (88.4)us-gaap_TreasuryStockValueAcquiredCostMethod       (88.4)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
       
Distributions to Noncontrolling Interests (8.3)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders           (8.3)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  1.2us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Cash Dividends Declared (275.7)us-gaap_DividendsCommonStock     (275.7)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Net Earnings 688.4mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests     683.8mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    4.6mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Equity Impact of Redeemable Noncontrolling Interest Accretion (28.2)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion     (28.2)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Other Comprehensive Income/(Loss) (63.1)us-gaap_OtherComprehensiveIncomeLossNetOfTax         (50.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
2.1us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(48.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
OtherComprehensiveIncomeLossOther (5.3)mjn_OtherComprehensiveIncomeLossOther   (5.3)mjn_OtherComprehensiveIncomeLossOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Increase (Decrease) in Temporary Equity                  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 8.3us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders           8.3us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  (1.2)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Net earnings of redeemable noncontrolling interest                 0.8us-gaap_TemporaryEquityNetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Redeemable Noncontrolling Interest Accretion                 28.2mjn_RedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Temporary Equity, Other Changes                 (14.4)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
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 68.4us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation   76.3us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  (7.9)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
       
Treasury Stock Acquired (52.9)us-gaap_TreasuryStockValueAcquiredCostMethod       (52.9)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
       
Treasury Stock, Retired, Cost Method, Amount 0us-gaap_TreasuryStockRetiredCostMethodAmount     (50.1)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
50.1us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
       
Distributions to Noncontrolling Interests (7.7)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders           (7.7)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
    
Cash Dividends Declared (304.0)us-gaap_DividendsCommonStock     (304.0)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Net Earnings 728.3mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests     719.8mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    8.5mjn_NetIncomeLossExcludingNetEarningsLossAssociatedWithRedeemableNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Equity Impact of Redeemable Noncontrolling Interest Accretion (23.0)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion     (23.0)mjn_EquityImpactOfRedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
         
Other Comprehensive Income/(Loss) (136.9)us-gaap_OtherComprehensiveIncomeLossNetOfTax         (129.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(129.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
OtherComprehensiveIncomeLossOther 3.9mjn_OtherComprehensiveIncomeLossOther   3.9mjn_OtherComprehensiveIncomeLossOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
           
Increase (Decrease) in Temporary Equity                  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 7.7us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders           7.7us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
    
Net earnings of redeemable noncontrolling interest                 0.5us-gaap_TemporaryEquityNetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Redeemable Noncontrolling Interest Accretion                 23.0mjn_RedeemableNoncontrollingInterestAccretion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Temporary Equity, Other Changes                 (7.2)us-gaap_TemporaryEquityOtherChanges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
Redeemable Noncontrolling Interest, BALANCE at Dec. 31, 2014 66.0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount               66.0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
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