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Property, Plant and Equipment
9 Months Ended
Sep. 30, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
(6) Property, Plant and Equipment

Property, plant and equipment consisted of the following:
 
September 30, 2016
 
December 31, 2015
 
(in millions)
Land and improvements
$
46.4

 
$
38.6

Buildings
64.8

 
53.6

Machinery and equipment
3,617.9

 
2,723.0

Automotive equipment
24.7

 
24.8

Furniture and fixtures
24.9

 
21.3

Leasehold improvements
3.6

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.7

 
16.3

Construction in progress
68.3

 
122.3

 
3,870.9

 
3,007.1

Accumulated depreciation
1,176.2

 
1,040.0

Total property, plant and equipment, net
$
2,694.7

 
$
1,967.1



Capitalized interest recognized as a reduction in interest expense for the three months ended September 30, 2016 and 2015 totaled approximately $1.6 million and $1.2 million, respectively. Capitalized interest recognized as a reduction in interest expense for the nine months ended September 30, 2016 and 2015 totaled approximately $5.0 million and $2.3 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 September 30, 2016 and December 31, 2015. Amortization of assets held under capital leases is included in depreciation expense.