ADDITIONAL BALANCE SHEET INFORMATION (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Reclamation Liability [Abstract]
Balance at the beginning of the period	$ 9.3	$ 8.0	[1]
Settlement of obligations	(1.3)	(0.5)	[1]
Liabilities incurred and accretion expense	1.8	1.0	[1]
Foreign currency	0.1	0	[1]
Balance at the end of the period	$ 9.9	$ 8.5	[1]

[1] Restated