Other Income (Expense) (Details) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Jun. 09, 2010 BsF	Mar. 31, 2010 BsF	Dec. 31, 2011 Pounds BsF	Dec. 31, 2010	Dec. 31, 2009
Other income (expense)			$ (31,700,000)	$ (28,100,000)	$ 7,000,000
Foreign currency transaction loss			(24,400,000)	7,700,000
Pre-tax charge on foreign currency devaluation transaction related to Venezuelan Bolivar				29,800,000
New official exchange rates of all goods for BsF per U.S. dollar			4.30
Prior official exchange rates of essential goods for BsF, per US dollar	6.88	2.60
Copper purchased, pounds			19,100,000
Foreign currency gains or losses			0
Foreign currency gains related to copper imports at the essential rate				16,600,000
Foreign exchange losses related to copper imports at the parallel rate				10,700,000
Not Designated as Hedging Instrument [Member]
Unrealized loss on derivatives			$ 6,100,000	$ 6,000,000