Concentrations (Tables)

12 Months Ended

Dec. 31, 2012

Risks and Uncertainties [Abstract]

Summary of percent of revenue, by product, accounting for more than 10% of sales

In prior periods, significant sales by product, as percentage of consolidated revenues, were as follows at the Resources segment:

	2011		2010
Lanthanum products	23	%	39	%
Cerium products	11	%	29	%
Neodymium and Praseodymium products	26	%	26	%

Schedules of Concentration of Risk by Customer Risk Factor

In prior periods, the Resources segment had the following sales by customers in excess of 15% of consolidated revenues (in millions):

	2011		2010
Hitachi Metals Ltd.	$	92.2	nm
Mitsubishi Unimetals USA	nm		$	8.5
W.R. Grace & Co.—Conn.	nm		$	7.4
Chuden Rare Earth Co. Ltd.	nm		$	5.4
Shin-Etsu Chemical Co.	nm		$	4.0