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Property, Plant, and Equipment
6 Months Ended
Jun. 30, 2014
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:

 
June 30, 2014
 
December 31, 2013
 
(in millions)
Land and improvements
$
36.7

 
$
36.1

Buildings
44.6

 
42.6

Machinery and equipment
2,341.4

 
2,312.5

Automotive equipment
20.0

 
19.2

Furniture and fixtures
19.3

 
18.3

Leasehold improvements
2.8

 
2.5

Aircraft
2.3

 
2.3

Railcars
7.9

 
7.9

Construction in progress
231.7

 
164.9

 
2,706.7

 
2,606.3

Accumulated depreciation
812.5

 
741.9

Total property, plant and equipment, net
$
1,894.2

 
$
1,864.4



Capitalized interest recognized as a reduction in interest expense for the three months ended June 30, 2014 and 2013 totaled approximately $2.9 million and $0.4 million, respectively. Capitalized interest recognized as a reduction in interest expense for the six months ended June 30, 2014 and 2013 totaled approximately $5.2 million and $1.2 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 June 30, 2014 and December 31, 2013. Amortization of assets held under capital leases is included in depreciation expense.