DERIVATIVE FINANCIAL INSTRUMENTS (Assets and Liabilities on a Gross Basis) (Details) - Total derivatives not designated as hedging instruments - USD ($) $ in Millions	Feb. 28, 2016	May. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 38.7	$ 39.5
Derivative Liabilities	22.2	27.4
Commodity contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	15.2	20.8
Commodity contracts | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	20.9	26.9
Foreign exchange contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	23.5	17.7
Foreign exchange contracts | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0.1	0.4
Other | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0.0	1.0
Other | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 1.2	$ 0.1