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Property, Plant, and Equipment
 12 Months Ended
Dec. 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:
 
December 31,
 
2015
 
2014
 
(in millions)
Land and improvements
$
38.6

 
$
37.4

Buildings
53.6

 
50.4

Machinery and equipment
2,723.0

 
2,581.2

Automotive equipment
24.8

 
22.1

Furniture and fixtures
21.3

 
19.0

Leasehold improvements
3.6

 
3.4

Aircraft
3.6

 
3.7

Railcars
16.3

 
14.5

Construction in progress
122.3

 
71.5

 
3,007.1

 
2,803.2

Accumulated depreciation
1,040.0

 
887.2

 
$
1,967.1

 
$
1,916.0



Capitalized interest recognized as a reduction in interest expense for the years ended December 31, 2015, 2014 and 2013 totaled approximately $3.7 million, $9.4 million and $3.6 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, 2015 and 2014, respectively. Amortization of assets held under capital leases is included in depreciation expense.