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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Foreign Currency Translation [Abstract]        
Foreign exchange gains(losses)   $ 10.7 $ (9.2) $ 11.3
Foreign currency exchange (income) expense   2.5 (2.3) 6.4
Cash and Cash Equivalents [Abstract]        
Maximum maturity of investments considered to be cash equivalents (in months)   3 months    
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   1.6 1.8  
Description of significant additions or deletions to deferred financing costs   In connection with the refinancing of the term loans in May 2012, the Company recorded a $2.8 million charge in the second quarter of 2012 which is included in other expense in its consolidated statements of operations, comprised of refinancing fees of $1.8 million and the write-off of existing deferred financing fees of $1.0 million. Deferred financing costs are being amortized to interest expense over the terms of the debt to which the costs relate.    
Total charges related to refinancing 2.8 2.8    
Write off of deferred financing costs, due to refinancing 1.0 1.0    
Deferred financing costs related to refinancing fees 1.8 1.8    
Inventories of spare parts related to long term assets   16.4 10.8  
Investments in marketable securities relating to deferred compensation arrangement   6.0 6.3  
Environmental Costs [Abstract]        
Environmental accrual   $ 1.6 $ 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)   84    
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)   44    
Typical maximum life leasehold and building improvements [Member]
       
Property, Plant and Equipment [Line Items]        
Estimated useful life, maximum (in years)   20