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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2016
Property, Plant and Equipment [Abstract]  
Summary of costs for property, plant, and equipment
Property, plant and equipment consisted of the following:
 
June 30, 2016
 
December 31, 2015
 
(in millions)
Land and improvements
$
46.5

 
$
38.6

Buildings
64.4

 
53.6

Machinery and equipment
3,510.5

 
2,723.0

Automotive equipment
24.7

 
24.8

Furniture and fixtures
22.7

 
21.3

Leasehold improvements
3.4

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.7

 
16.3

Construction in progress
156.9

 
122.3

 
3,849.4

 
3,007.1

Accumulated depreciation
1,125.9

 
1,040.0

Total property, plant and equipment, net
$
2,723.5

 
$
1,967.1