FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Liabilities:
Long-term debt, Carrying Value	$ 5,950.9	$ 4,180.9
Long-term debt, Fair Value	5,338.4	4,369.6
Short term Investment:
Trading securities	878.0	333.7
Fair value measurements recurring \| Fair value as of the end of the period
Short term Investment:
Trading securities	878.0	333.7
Derivative:
Total assets, fair value	1,136.0	646.3
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	189.3	202.2
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	64.6	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	3.9	4.6
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short term Investment:
Trading securities	878.0	333.7
Derivative:
Total assets, fair value	1,131.9	641.4
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	189.3	202.2
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	64.6	105.5
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Derivative:
Total assets, fair value	4.1	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	$ 3.9	$ 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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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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