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PROPERTY PLANT AND EQUIPMENT
12 Months Ended
Dec. 31, 2012
PROPERTY PLANT AND EQUIPMENT [Abstract]  
PROPERTY PLANT AND EQUIPMENT
 
 
5. 
PROPERTY PLANT AND EQUIPMENT
 
Property, plant and equipment consists of the following at December 31 (in millions):
 
   
2012
  
2011
 
Land, buildings and structures and leasehold improvements
 $309.0  $275.9 
Machinery and equipment
  596.5   541.8 
Office furniture and equipment
  20.8   21.3 
Mineral interests
  184.4   174.4 
Construction in progress
  103.0   68.8 
    1,213.7   1,082.2 
Less accumulated depreciation and depletion
  (568.5)  (508.8)
Property, plant and equipment, net
 $645.2  $573.4