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INCOME TAXES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Effective tax rate (as a percent) 23.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 25.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Gross reserve for uncertain tax positions related to foreign and domestic matters, including penalties and interest $ 155.7us-gaap_UnrecognizedTaxBenefits   $ 146.8us-gaap_UnrecognizedTaxBenefits
Net receivable from BMS related to 2009 taxes $ 9.8mjn_IncomeTaxReceivableNetFromFormerParent   $ 9.7mjn_IncomeTaxReceivableNetFromFormerParent