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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Foreign Currency Translation [Abstract]      
Foreign currency exchange gains (losses) $ 2.3 $ (6.4) $ (3.2)
Cash and Cash Equivalents [Abstract]      
Maximum maturity of investments considered to be cash equivalents (in months) 3M    
Intangible Assets [Abstract]      
Estimated useful lives of intangible assets, minimum (in years) 5    
Estimated useful lives of intangible assets, maximum (in years) 50    
Other Noncurrent Assets [Abstract]      
Deferred financing costs 6.2 6.2  
Accumulated amortization of deferred financing costs 1.8 0.5  
Description of significant additions or deletions to deferred financing costs In connection with the refinancing of the credit agreement in 2010, the Company wrote off approximately 0.1 million of deferred financing costs previously capitalized and capitalized approximately 2.6 million in additional deferred financing costs. In connection with the refinancing of the 12% senior subordinated discount notes “12% Senior Subordinated Discount Notes” with 8% senior notes “8% Senior Notes”, the Company wrote off 0.9 million of the Company’s unamortized deferred financing costs related to the 12% Senior Subordinated Discount Notes, which have been included in other, net in the Consolidated Statements of Operations for 2009 and capitalized approximately 2.4 million in deferred financing costs related to the 8% Senior Notes In connection with the refinancing of the credit agreement in 2010, the Company wrote off approximately 0.1 million of deferred financing costs previously capitalized and capitalized approximately 2.6 million in additional deferred financing costs. In connection with the refinancing of the 12% senior subordinated discount notes “12% Senior Subordinated Discount Notes” with 8% senior notes “8% Senior Notes”, the Company wrote off 0.9 million of the Company’s unamortized deferred financing costs related to the 12% Senior Subordinated Discount Notes, which have been included in other, net in the Consolidated Statements of Operations for 2009 and capitalized approximately 2.4 million in deferred financing costs related to the 8% Senior Notes  
Write off of deferred financing costs, due to refinancing   0.1 0.9
Additional deferred financing costs capitalized   2.6 2.4
Inventories of spare parts related to long term assets 10.8 10.3  
Investments in marketable securities relating to deferred compensation arrangement 6.3 6.2  
Environmental Costs [Abstract]      
Environmental accrual $ 1.7 $ 1.7  
Sales [Member]
     
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 10.00% 10.00% 10.00%
Accounts Receivable [Member]
     
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 10.00% 10.00% 10.00%
Land Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum (in years) 10    
Estimated useful life, maximum (in years) 25    
Buildings and Structures [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum (in years) 10    
Estimated useful life, maximum (in years) 30    
Leasehold and Building Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum (in years) 5    
Estimated useful life, maximum (in years) 40    
Machinery and Equipment - Vehicles [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum (in years) 3    
Estimated useful life, maximum (in years) 10    
Machinery and Equipment - Other Mining and Production [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum (in years) 3    
Estimated useful life, maximum (in years) 20    
Office Furniture and Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life, minimum (in years) 3    
Estimated useful life, maximum (in years) 10    
Mineral Interests [Member]
     
Property, Plant and Equipment [Line Items]      
Weighted average amortization period (in years) 85    
Estimated useful life, minimum (in years) 20    
Estimated useful life, maximum (in years) 99    
Other Mineral Properties [Member]
     
Property, Plant and Equipment [Line Items]      
Weighted average amortization period (in years) 45