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FINANCIAL INSTRUMENTS: (Details) (USD $) In Millions, unless otherwise specified																																			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Swap contracts	Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Zero cost collar contracts	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Zero cost collar contracts	Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Copper	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Copper	Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Molybdenum	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Molybdenum	Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Corporate bonds	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Corporate bonds	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Asset backed obligations	Dec. 31, 2011 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities	Dec. 31, 2010 Fair value measurements recurring Fair value as of the end of the period Mortgage backed securities	Dec. 31, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Dec. 31, 2010 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1)	Dec. 31, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Copper	Dec. 31, 2010 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Copper	Dec. 31, 2011 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Molybdenum	Dec. 31, 2010 Fair value measurements recurring Quoted prices in active markets for identical assets (Level 1) Molybdenum	Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2)	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2)	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Swap contracts	Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Zero cost collar contracts	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Zero cost collar contracts	Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Corporate bonds	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Asset backed obligations	Dec. 31, 2011 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities	Dec. 31, 2010 Fair value measurements recurring Significant other observable inputs (Level 2) Mortgage backed securities	Dec. 31, 2010 Fair value measurements recurring Significant unobservable inputs (Level 3)	Dec. 31, 2010 Fair value measurements recurring Significant unobservable inputs (Level 3) Mortgage backed securities	Dec. 31, 2011 Mitsui loan
Liabilities:
Long-term debt, Carrying Value	$ 2,745.7	$ 2,760.4
Long-term debt, Fair Value	2,974.9
Fair values of assets and liabilities measured at fair value on a recurring basis
Fair value calculation, present value based on cash flow discount rate, weighted average cost of capital																																			10.00%
Short term Investment:
Trading securities investment			514.6	66.9													514.6	66.9
Available-for-sale debt securities:
Available-for-sale debt securities												0.5	0.4	0.3	6.8	8.6												0.5	0.4	0.3	6.8	7.4		1.2
Derivative:
Derivatives - classified as cash flow hedges:						8.9																				8.9
Provisionally priced sales								221.5	60.7	138.1	149.7								221.5	60.7	138.1	149.7
Total assets, fair value			890.4														874.2						16.2
Other current liabilities:
Liability derivatives Classified as cash flow hedges:					(124.4)		(72.6)																		(124.4)		(72.6)
Total				$ 89.6														$ 277.3						$ (188.9)									$ 1.2

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