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Property, Plant, and Equipment
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
(6) Property, Plant and Equipment

Property, plant, and equipment consisted of the following:
 
December 31,
 
2016
 
2015
 
(in millions)
Land and improvements
$
46.5

 
$
38.6

Buildings
64.8

 
53.6

Machinery and equipment
3,656.5

 
2,723.0

Automotive equipment
24.7

 
24.8

Furniture and fixtures
28.9

 
21.3

Leasehold improvements
3.6

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.8

 
16.3

Construction in progress
54.2

 
122.3

 
3,899.6

 
3,007.1

Accumulated depreciation
1,227.5

 
1,040.0

     Total Property, Plant and Equipment, net
$
2,672.1

 
$
1,967.1



Capitalized interest recognized as a reduction in interest expense for the years ended December 31, 2016, 2015 and 2014 totaled approximately $5.4 million, $3.7 million and $9.4 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, 2016 and 2015, respectively. Amortization of assets held under capital leases is included in depreciation expense.