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Property, Plant, and Equipment
 6 Months Ended
Jun. 30, 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:
 
June 30, 2015
 
December 31, 2014
 
(in millions)
Land and improvements
$
37.8

 
$
37.4

Buildings
51.5

 
50.4

Machinery and equipment
2,617.2

 
2,581.2

Automotive equipment
23.4

 
22.1

Furniture and fixtures
19.9

 
19.0

Leasehold improvements
3.4

 
3.4

Aircraft
3.6

 
3.7

Railcars
14.9

 
14.5

Construction in progress
113.7

 
71.5

 
2,885.4

 
2,803.2

Accumulated depreciation
968.9

 
887.2

Total property, plant and equipment, net
$
1,916.5

 
$
1,916.0



Capitalized interest recognized as interest expense for the three months ended June 30, 2015 and 2014 totaled approximately $0.8 million and $2.9 million, respectively. Capitalized interest recognized as a reduction in interest expense for the six months ended June 30, 2015 and 2014 totaled approximately $1.2 million and $5.2 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, 2015 and December 31, 2014. Amortization of assets held under capital leases is included in depreciation expense.