ADDITIONAL BALANCE SHEET INFORMATION (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Reclamation liability
Balance at the beginning of the period	$ 9.3	$ 7.5
Settlement of obligations	(3.1)	(2.8)
Liabilities incurred and accretion expense	3.8	4.4
Foreign currency	(0.1)	(0.3)
Balance at the end of the period	$ 9.9	$ 8.8