FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Liabilities:
Long-term debt, Carrying Value	$ 5,952.1	$ 5,951.5
Long-term debt, Fair Value	5,705.6	5,211.5
Short term Investment:
Trading securities	279.6	600.2
Fair value measurements recurring \| Fair value as of the end of the period
Short term Investment:
Trading securities	279.6	600.2
Derivative:
Total assets, fair value	672.6	1,016.9
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	309.3	351.0
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	80.7	62.4
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	0.1	0.2
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	2.9	3.1
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short term Investment:
Trading securities	279.6	600.2
Derivative:
Total assets, fair value	669.6	1,013.6
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	309.3	351.0
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	80.7	62.4
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Derivative:
Total assets, fair value	3.0	3.3
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Corporate bonds
Available-for-sale debt securities:
Available-for-sale debt securities	0.1	0.2
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	$ 2.9	$ 3.1

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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