SEGMENT INFORMATION - Schedule of Net Sales by Product Line (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 967.0	$ 977.5	$ 1,032.4	$ 1,094.4	$ 1,094.2	$ 1,090.7	$ 1,111.1	$ 1,113.3	$ 4,071.3	$ 4,409.3	$ 4,200.7
Infant Formula
Segment Reporting Information [Line Items]
Net sales									2,407.1	2,537.0	2,459.7
Children’s Nutrition
Segment Reporting Information [Line Items]
Net sales									1,593.1	1,788.4	1,653.3
Other
Segment Reporting Information [Line Items]
Net sales									$ 71.1	$ 83.9	$ 87.7