FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Liabilities:
Long-term debt, Carrying Value	$ 5,954.9	$ 5,954.2
Long-term debt, Fair Value	6,491.8	6,212.0
Short-term Investment:
Trading securities	50.6	49.2
Available-for-sale debt securities:
Available-for-sale Securities, Current, Total	2.1	2.1
Fair value measurements recurring \| Fair value as of the end of the period
Short-term Investment:
Trading securities	50.6	49.2
Derivative:
Total assets, fair value	279.4	309.1
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	135.0	203.8
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	91.7	54.0
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
Fair value measurements recurring \| Asset backed securities \| Fair value as of the end of the period
Available-for-sale debt securities:
Available-for-sale debt securities	1.6
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	0.4	2.1
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short-term Investment:
Trading securities	50.6	49.2
Derivative:
Total assets, fair value	277.3	307.0
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	135.0	203.8
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	91.7	54.0
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Available-for-sale debt securities:
Available-for-sale Securities, Current, Total	2.1	2.1
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Corporate bonds
Available-for-sale debt securities:
Available-for-sale debt securities	0.1
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Asset backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	1.6
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	$ 0.4	$ 2.1

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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