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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
(6) Property, Plant and Equipment

Property, plant and equipment consisted of the following:
 
June 30, 2017
 
December 31, 2016
 
(in millions)
Land and improvements
$
46.5

 
$
46.5

Buildings
80.9

 
64.8

Machinery and equipment
3,676.7

 
3,656.5

Automotive equipment
25.8

 
24.7

Furniture and fixtures
29.8

 
28.9

Leasehold improvements
4.8

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.8

 
16.8

Construction in progress
66.8

 
54.2

 
3,951.7

 
3,899.6

Accumulated depreciation
1,330.5

 
1,227.5

Total property, plant and equipment, net
$
2,621.2

 
$
2,672.1



Capitalized interest recognized as a reduction in interest expense for the three months ended June 30, 2017 and 2016 totaled approximately $0.2 million and $1.9 million, respectively. Capitalized interest recognized as a reduction in interest expense for the six months ended June 30, 2017 and 2016 totaled approximately $0.5 million and $3.4 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, 2017 and December 31, 2016. Amortization of assets held under capital leases is included in depreciation expense.