ADDITIONAL BALANCE SHEET INFORMATION (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Inventories [Abstract]
Crude stockpile inventories	$ 56.8	[1]	$ 53.4	[1]
In-process and finished goods inventories	66.5	[1]	65.0	[1]
Other raw material, container, and supplies inventories	25.0	[1]	25.9	[1]
Inventory, Net, Total	$ 148.3	[1]	$ 144.3	[1],[2]

[1] Restated

[2] Condensed from audited financial statements.