ADDITIONAL BALANCE SHEET INFORMATION (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Reclamation liability [Abstract]
Balance at beginning of period	$ 9.5	$ 9.3
Settlement of obligations	(1.3)	(3.2)
Liabilities incurred and accretion expense	0.1	2.9
Foreign currency	(0.5)	0.3
Balance at end of period	$ 7.8	$ 9.3