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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Liabilities:
Long-term debt, Carrying Value	$ 4,205.5	$ 4,204.9
Long-term debt, Fair Value	4,495.3	4,088.8
Short term Investment:
Trading securities investment	284.4	202.6
Fair value measurements recurring | Fair value as of the end of the period
Short term Investment:
Trading securities investment	284.4	202.6
Derivative:
Total assets, fair value	503.0	362.4
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales	99.7	53.9
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales	113.4	100.2
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	0.4	0.4
Fair value measurements recurring | Fair value as of the end of the period | Asset backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.1	0.1
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	5.0	5.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1)
Short term Investment:
Trading securities investment	284.4	202.6
Derivative:
Total assets, fair value	497.5	356.7
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales	99.7	53.9
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales	113.4	100.2
Fair value measurements recurring | Significant other observable inputs (Level 2)
Derivative:
Total assets, fair value	5.5	5.7
Fair value measurements recurring | Significant other observable inputs (Level 2) | Corporate bonds
Available-for-sale debt securities:
Available-for-sale debt securities	0.4	0.4
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.1	0.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	$ 5.0	$ 5.2

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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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