FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Liabilities:
Long-term debt, Carrying Value	$ 5,951.5	$ 4,180.9
Long-term debt, Fair Value	5,211.5	4,369.6
Short term Investment:
Trading securities	600.2	333.7
Fair value measurements recurring \| Fair value as of the end of the period
Short term Investment:
Trading securities	600.2	333.7
Derivative:
Total assets, fair value	1,016.9	646.3
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	351.0	202.2
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	62.4	105.5
Fair value measurements recurring \| Corporate bonds \| Fair value as of the end of the period
Available-for-sale debt securities:
Available-for-sale debt securities	0.2	0.3
Fair value measurements recurring \| Mortgage backed securities \| Fair value as of the end of the period
Available-for-sale debt securities:
Available-for-sale debt securities	3.1	4.6
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short term Investment:
Trading securities	600.2	333.7
Derivative:
Total assets, fair value	1,013.6	641.4
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	351.0	202.2
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	62.4	105.5
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Derivative:
Total assets, fair value	3.3	4.9
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Corporate bonds
Available-for-sale debt securities:
Available-for-sale debt securities	0.2	0.3
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	$ 3.1	$ 4.6

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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