FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Liabilities:
Long-term debt, Carrying Value	$ 6,152.2	$ 4,180.9
Long-term debt, Fair Value	6,198.7	4,369.6
Short term Investment:
Trading securities investment	$ 569.0	$ 333.7
6.375% Senior unsecured notes due 2015
Derivative:
Interest rate (as a percent)	6.375%	6.375%
Fair value measurements recurring \| Fair value as of the end of the period
Short term Investment:
Trading securities investment	$ 569.0	$ 333.7
Derivative:
Total assets, fair value	1,002.9	646.3
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	322.6	202.2
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	107.0	105.5
Fair value measurements recurring \| Fair value as of the end of the period \| Corporate bonds
Available-for-sale debt securities:
Available-for-sale debt securities	0.2	0.3
Fair value measurements recurring \| Fair value as of the end of the period \| Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	4.1	4.6
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short term Investment:
Trading securities investment	569.0	333.7
Derivative:
Total assets, fair value	998.6	641.4
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	322.6	202.2
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	107.0	105.5
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Derivative:
Total assets, fair value	4.3	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	$ 4.1	$ 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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