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Property, Plant, and Equipment
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
(5) Property, Plant and Equipment

A summary of costs for property, plant, and equipment is as follows:

 
March 31, 2015
 
December 31, 2014
 
(in millions)
Land and improvements
$
37.7

 
$
37.4

Buildings
51.4

 
50.4

Machinery and equipment
2,606.7

 
2,581.2

Automotive equipment
22.5

 
22.1

Furniture and fixtures
19.1

 
19.0

Leasehold improvements
3.4

 
3.4

Aircraft
3.7

 
3.7

Railcars
14.5

 
14.5

Construction in progress
80.6

 
71.5

 
2,839.6

 
2,803.2

Accumulated depreciation
928.0

 
887.2

Total property, plant and equipment, net
$
1,911.6

 
$
1,916.0



Capitalized interest recognized as a reduction in interest expense for the three months ended March 31, 2015 and 2014 totaled approximately $0.4 million and $2.3 million, respectively. Land, buildings and equipment that are under a capital lease obligation had an original carrying value of approximately $24.8 million at both March 31, 2015 and December 31, 2014. Amortization of assets held under capital leases is included in depreciation expense.