CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015 Proceeding	Mar. 31, 2014
Subsequent Event [Line Items]
Accrual related to the China investigation	$ 12.0	$ 0
Minimum number of proceedings that could have a material impact	1

The minimum number of proceedings that could have a material adverse affect on the Company's results of operations for the periods in which a loss is recognized.

No definition available.

Name:	mjn_LossContingencyNumberOfProceedingsThatCouldHaveMaterialAdverseAffectMinimum
Namespace Prefix:	mjn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant