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Property, Plant, and Equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
(6) Property, Plant and Equipment

A summary of costs for property, plant, and equipment is as follows:
 
December 31,
 
2014
 
2013
 
(in millions)
Land and improvements
$
37.4

 
$
36.1

Buildings
50.4

 
42.6

Machinery and equipment
2,581.2

 
2,312.5

Automotive equipment
22.1

 
19.2

Furniture and fixtures
19.0

 
18.3

Leasehold improvements
3.4

 
2.5

Aircraft
3.7

 
2.3

Railcars
14.5

 
7.9

Construction in progress
71.5

 
164.9

 
2,803.2

 
2,606.3

Accumulated depreciation
887.2

 
741.9

 
$
1,916.0

 
$
1,864.4



Capitalized interest recognized as a reduction in interest expense for the years ended December 31, 2014, 2013 and 2012 totaled approximately $9.4 million, $3.6 million and $10.8 million, respectively. Land, building and equipment that are under a capital lease obligation had an original carrying value of approximately $24.8 million at both December 31, 2014 and 2013, respectively. Amortization of assets held under capital leases is included in depreciation expense.