DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 19.3	$ 23.9	$ 8.6
Asset derivatives	9.4	13.8	17.0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	18.3	21.4	7.9
Asset derivatives	0	2.2	15.2
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	2.2	6.6
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0
Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	0.2
Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	11.6	12.7	6.4
Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Current Installments of Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	1.3
Designated as Hedging Instrument [Member] | Commodity Contracts Gains [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(2.0)	(2.5)	0
Designated as Hedging Instrument [Member] | Commodity Contracts Gains [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	9.5
Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	8.7	11.2	0
Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	(0.9)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	1.0	2.5	0.7
Asset derivatives	9.4	11.6	1.8
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	12.1	11.6	0
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 [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	1.8
Not Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	(2.7)	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	1.0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract Loss [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0	0.6
Not Designated as Hedging Instrument [Member] | Commodity Contracts Gains [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(0.1)	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	0
Not Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	1.1	1.5	0.1
Not Designated as Hedging Instrument [Member] | Commodity Contracts Losses [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 0	$ 0	$ 0