ADDITIONAL BALANCE SHEET INFORMATION (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclamation liability [Abstract]
Balance at beginning of period	$ 9.5	$ 9.3
Settlement of obligations	(0.7)	(1.3)
Liabilities incurred and accretion expense	0.4	1.8
Foreign currency	(0.2)	0.1
Balance at end of period	$ 9.0	$ 9.9