XML 57 R40.htm IDEA: XBRL DOCUMENT v3.3.1.900
Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Major categories of property, plant and equipment and accumulated depreciation and depletion
The major categories of property, plant and equipment and accumulated depreciation and depletion are presented below:

  
December 31,
 
  
2015
  
2014
 
  
(millions of dollars)
 
Mineral rights and reserves
 
$
553.8
  
$
575.9
 
Land
  
39.8
   
44.9
 
Buildings
  
179.7
   
198.2
 
Machinery and equipment
  
1,130.7
   
1,121.5
 
Furniture and fixtures and other
  
209.7
   
153.1
 
Construction in progress
  
53.6
   
80.6
 
   
2,167.3
   
2,174.2
 
Less: accumulated depreciation and depletion
  
(1,063.0
)
  
(992.1
)
Property, plant and equipment, net
 
$
1,104.3
  
$
1,182.1