FAIR VALUE MEASUREMENT (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Liabilities:
Long-term debt, Carrying Value	$ 4,206.0us-gaap_LongTermDebt	$ 4,204.9us-gaap_LongTermDebt
Long-term debt, Fair Value	4,369.6us-gaap_LongTermDebtFairValue
6.375% Senior unsecured notes due 2015
Liabilities:
Long-term debt, Carrying Value	199.8	199.7
Interest rate (as a percent)	6.375%
Fair value measurements recurring \| Fair value as of the end of the period
Short term Investment:
Trading securities investment	333.7	202.6
Derivative:
Total assets, fair value	646.3	362.4
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	202.2	53.9
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	105.5	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	0.3	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
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	4.6	5.2
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short term Investment:
Trading securities investment	333.7	202.6
Derivative:
Total assets, fair value	641.4	356.7
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	202.2	53.9
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	105.5	100.2
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Derivative:
Total assets, fair value	4.9	5.7
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Corporate bonds
Available-for-sale debt securities:
Available-for-sale debt securities	0.3	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
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	$ 4.6	$ 5.2

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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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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