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PROPERTY PLANT AND EQUIPMENT
12 Months Ended
Dec. 31, 2014
PROPERTY PLANT AND EQUIPMENT [Abstract]  
PROPERTY PLANT AND EQUIPMENT
6.
PROPERTY PLANT AND EQUIPMENT

Property, plant and equipment consists of the following at December 31 (in millions):

  
2014
  
2013
 
Land, buildings and structures and leasehold improvements
 
$
352.2
  
$
347.1
 
Machinery and equipment
  
669.1
   
668.0
 
Office furniture and equipment
  
17.5
   
21.5
 
Mineral interests
  
179.6
   
180.9
 
Construction in progress
  
108.9
   
69.5
 
   
1,327.3
   
1,287.0
 
Less accumulated depreciation and depletion
  
(626.4
)
  
(609.7
)
Property, plant and equipment, net
 
$
700.9
  
$
677.3