DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 2.9	$ 3.5	$ 5.3
Liability derivatives	12.6	13.1	10.0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Liability derivatives	11.4	11.6	10.4
Designated as Hedging Instrument | Interest Rate Contract Gains | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Designated as Hedging Instrument | Interest Rate Contract Loss | Long-term Debt
Derivatives, Fair Value [Line Items]
Liability derivatives	3.8	4.5	6.6
Designated as Hedging Instrument | Commodity Contracts Losses | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Designated as Hedging Instrument | Commodity Contracts Losses | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	8.1	7.2	4.8
Designated as Hedging Instrument | Commodity Contracts Gains | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Designated as Hedging Instrument | Commodity Contracts Gains | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(0.5)	(0.1)	(1.0)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	2.9	3.5	5.3
Liability derivatives	1.2	1.5	(0.4)
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	3.9	4.3	6.8
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	0
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(1.0)	(0.8)	(1.5)
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	0
Not Designated as Hedging Instrument | Commodity Contracts Losses | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Not Designated as Hedging Instrument | Commodity Contracts Losses | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	1.2	1.5	0
Not Designated as Hedging Instrument | Commodity Contracts Gains | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Not Designated as Hedging Instrument | Commodity Contracts Gains | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 0	$ 0	$ (0.4)