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PROPERTY, PLANT AND EQUIPMENT
12 Months Ended
Dec. 31, 2011
PROPERTY, PLANT AND EQUIPMENT [Abstract]  
PROPERTY, PLANT AND EQUIPMENT
 

PROPERTY, PLANT AND EQUIPMENT
     
December 31,
 
 
Useful Lives
 
2011
   
2010
 
     
($ in millions)
 
Land and improvements to land
10-20 Years
 
$
149.4
   
$
141.5
 
Buildings and building equipment
10-25 Years
   
183.9
     
163.5
 
Machinery and equipment
3-15 Years
   
1,540.3
     
1,379.0
 
Leasehold improvements
     
2.5
     
2.1
 
Construction in progress
     
153.3
     
57.0
 
Property, plant and equipment
     
2,029.4
     
1,743.1
 
Accumulated depreciation
     
(1,144.0
)
   
(1,068.1
)
Property, plant and equipment, net
   
$
885.4
   
$
675.0
 

Depreciation expense was $97.4 million, $85.4 million and $70.2 million for 2011, 2010 and 2009, respectively.  Leased assets capitalized and included above are not significant.  Interest capitalized was $1.2 million, $0.9 million and $9.7 million for 2011, 2010 and 2009, respectively.  Maintenance and repairs charged to operations amounted to $135.7 million, $128.8 million and $135.0 million in 2011, 2010 and 2009, respectively.

The consolidated statements of cash flows for the years ended December 31, 2011, 2010 and 2009, included a $(23.7) million, $2.3 million and $2.6 million, respectively, (decrease) increase to capital expenditures, with the corresponding change to accounts payable and accrued liabilities, related to purchases of property, plant and equipment included in accounts payable at December 31, 2011, 2010 and 2009.

During the fourth quarter of 2011, we entered into a sale/leaseback transaction for chlorine railcars that we acquired in 2011 for $3.2 million.