CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
NET SALES	$ 4,409.3us-gaap_SalesRevenueGoodsNet	$ 4,200.7us-gaap_SalesRevenueGoodsNet	$ 3,901.3us-gaap_SalesRevenueGoodsNet
Cost of Products Sold	1,700.6us-gaap_CostOfGoodsSold	1,528.5us-gaap_CostOfGoodsSold	1,503.8us-gaap_CostOfGoodsSold
GROSS PROFIT	2,708.7us-gaap_GrossProfit	2,672.2us-gaap_GrossProfit	2,397.5us-gaap_GrossProfit
Operating Expenses:
Selling, General and Administrative Expense	978.9	903.5	904.5
Advertising and Promotion	638.7us-gaap_MarketingAndAdvertisingExpense	645.1us-gaap_MarketingAndAdvertisingExpense	552.8us-gaap_MarketingAndAdvertisingExpense
Research and Development Expense	115.1us-gaap_ResearchAndDevelopmentExpense	100.2us-gaap_ResearchAndDevelopmentExpense	100.1us-gaap_ResearchAndDevelopmentExpense
Other (Income)/Expenses—net	(12.3)mjn_OtherExpensesincomenet	48.5mjn_OtherExpensesincomenet	4.8mjn_OtherExpensesincomenet
EARNINGS BEFORE INTEREST AND INCOME TAXES	988.3	974.9	835.3
Interest Expense-net	60.3	50.6	65.0
EARNINGS BEFORE INCOME TAXES	928.0	924.3	770.3
Provision for Income Taxes	199.2us-gaap_IncomeTaxExpenseBenefit	235.1us-gaap_IncomeTaxExpenseBenefit	182.0us-gaap_IncomeTaxExpenseBenefit
NET EARNINGS	728.8us-gaap_ProfitLoss	689.2us-gaap_ProfitLoss	588.3us-gaap_ProfitLoss
Less: Net Earnings Attributable to Noncontrolling Interests	9.0	5.4	7.9
Net earnings attributable to shareholders	$ 719.8us-gaap_NetIncomeLoss	$ 683.8us-gaap_NetIncomeLoss	$ 580.4us-gaap_NetIncomeLoss
Earnings per Share-Basic
Net Earnings Attributable to Shareholders (in dollars per share)	$ 3.55us-gaap_EarningsPerShareBasic	$ 3.37us-gaap_EarningsPerShareBasic	$ 2.84us-gaap_EarningsPerShareBasic
Earnings per Share-Diluted
Net Earnings Attributable to Shareholders (in dollars per share - diluted)	$ 3.54us-gaap_EarningsPerShareDiluted	$ 3.36us-gaap_EarningsPerShareDiluted	$ 2.83us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Weighted Average Number of Shares Issued, Basic	202.1	202.4	203.6
Weighted Average Number of Shares Outstanding, Basic	202.7	203.1	204.3
Common Stock, Dividends, Per Share, Declared	$ 1.50	$ 1.36	$ 1.20

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