DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 3.5	$ 7.2
Derivative Liability, Fair Value, Gross Liability	13.1	7.3
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	1.2
Derivative Liability, Fair Value, Gross Liability	11.6	7.3
Designated as Hedging Instrument | Interest Rate Contract Gains | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Designated as Hedging Instrument | Interest Rate Contract Gains | Long-term Debt
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	4.5	7.3
Designated as Hedging Instrument | Commodity Contracts Losses | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	(2.4)
Designated as Hedging Instrument | Commodity Contracts Losses | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	7.2	0
Designated as Hedging Instrument | Commodity Contracts Gains | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	3.6
Designated as Hedging Instrument | Commodity Contracts Gains | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(0.1)	0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	3.5	6.0
Derivative Liability, Fair Value, Gross Liability	1.5	0
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4.3	7.6
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	(0.8)	(1.7)
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Commodity Contracts Losses | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	(0.1)
Not Designated as Hedging Instrument | Commodity Contracts Losses | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	1.5	0
Not Designated as Hedging Instrument | Commodity Contracts Gains | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0.2
Not Designated as Hedging Instrument | Commodity Contracts Gains | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0	$ 0