DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 6.5	$ 15.9	$ 17.8
Liability derivatives	9.6	10.2	10.9
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	7.5	8.4
Liability derivatives	9.2	10.2	10.9
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	8.1	10.2	10.9
Designated as Hedging Instrument [Member] | Commodity Contracts Gains [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(2.9)	0	0
Designated as Hedging Instrument [Member] | Commodity Contracts Gains [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	9.6	10.4
Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	4.0	0	0
Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	(2.1)	(2.0)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	6.5	8.4	9.4
Liability derivatives	0.4	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	8.4	11.9	12.9
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	(1.9)	(3.6)	(4.0)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	0
Not Designated as Hedging Instrument [Member] | Commodity Contracts Gains [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	0
Not Designated as Hedging Instrument [Member] | Commodity Contracts Gains [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0.1	0.7
Not Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0.4	0	0
Not Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 0	$ 0	$ (0.2)