DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Location and Fair Value Amounts of Derivative Instruments Reported in Balance Sheet (Details) - Not Designated as Hedging Instrument - Commodity contracts $ in Millions	Mar. 31, 2017 USD ($)
Asset Derivatives
Fair Value of Derivative Instruments, Assets	$ 6.6
Liability Derivatives
Fair Value of Derivative Instruments, Liabilities	0.0
Current assets: Fair value of derivative contracts
Asset Derivatives
Fair Value of Derivative Instruments, Assets	3.4
Long-term assets: Fair value of derivative contracts
Asset Derivatives
Fair Value of Derivative Instruments, Assets	3.2
Current liabilities: Fair value of derivative contracts
Liability Derivatives
Fair Value of Derivative Instruments, Liabilities	0.0
Long-term liabilities: Fair value of derivative contracts
Liability Derivatives
Fair Value of Derivative Instruments, Liabilities	$ 0.0