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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
(6) Property, Plant and Equipment

Property, plant and equipment consisted of the following:
 
December 31,
 
2017
 
2016
 
(in millions)
Land and improvements
$
47.4

 
$
46.5

Buildings
83.3

 
64.8

Machinery and equipment
3,733.8

 
3,656.5

Automotive equipment
24.7

 
24.7

Furniture and fixtures
32.4

 
28.9

Leasehold improvements
4.6

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.8

 
16.8

Construction in progress
56.2

 
54.2

 
4,002.8

 
3,899.6

Less: Accumulated depreciation
1,431.0

 
1,227.5

     Total Property, plant and equipment, net
$
2,571.8

 
$
2,672.1



Capitalized interest recognized as a reduction in interest expense for the years ended December 31, 2017, 2016 and 2015 totaled approximately $1.1 million, $5.4 million and $3.7 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 December 31, 2017 and 2016. Amortization of assets held under capital leases is included in depreciation expense.