DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Reclassifications from Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Commodity costs		$ 522.7	$ 1,238.2	$ 1,972.4	$ 3,986.7
Interest expense, net		88.2	137.1	214.5	294.2
Total Reclassifications from AOCI		(184.5)	(117.5)	(341.8)	(385.7)
Reclassification out of AOCI [Member] | Accumulated Net (Gain) Loss from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total Reclassifications from AOCI		(2.9)	5.6	(6.4)	22.2
Interest Rate Contracts [Member] | Reclassification out of AOCI [Member] | Accumulated Net (Gain) Loss from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense, net	[1],[2]	3.6	4.0	11.9	12.1
Interest Rate Contracts [Member] | Reclassification out of AOCI [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total Reclassifications from AOCI		(0.1)		(0.1)
Commodity Contract [Member] | Reclassification out of AOCI [Member] | Accumulated Net (Gain) Loss from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Commodity costs	[3],[4],[5]	(6.5)	1.6	(18.3)	10.1
Commodity Contract [Member] | Reclassification out of AOCI [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total Reclassifications from AOCI		$ (2.1)	$ (0.5)	$ 5.8	$ (2.3)

[1] Excludes NCI gain of $0.1 million reclassified from AOCI for the three and nine months ending September 30, 2015.

[2] Loss reported within “Interest expense, net” in the consolidated statements of income.

[3] Excludes NCI gain of $2.1 million and $0.5 million reclassified from AOCI for the three months ending September 30, 2015 and 2014, respectively.

[4] Excludes NCI loss of $5.8 million and gain of $2.3 million reclassified from AOCI for the nine months ending September 30, 2015 and 2014, respectively.

[5] Loss (gain) reported within “Commodity costs” in the consolidated statements of income.