FINANCIAL INSTRUMENTS: - (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Liabilities:
Long-term debt, Carrying Value	$ 5,953.5	$ 5,951.5
Long-term debt, Fair Value	6,411.0	5,211.5
Short-term Investment:
Trading securities	98.3	600.2
Available-for-sale debt securities:
Available-for-sale Securities, Current, Total	2.5	3.3
Fair value measurements recurring \| Fair value as of the end of the period
Short-term Investment:
Trading securities	98.3	600.2
Derivative:
Total assets, fair value	666.1	1,016.9
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	454.7	351.0
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	110.6	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	2.4	3.1
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short-term Investment:
Trading securities	98.3	600.2
Derivative:
Total assets, fair value	663.6	1,013.6
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	454.7	351.0
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	110.6	62.4
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Available-for-sale debt securities:
Available-for-sale Securities, Current, Total	2.5	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	$ 2.4	$ 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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