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Property, Plant, and Equipment (Tables)
 6 Months Ended
Jun. 30, 2015
Property, Plant and Equipment [Abstract]  
Summary of costs for property, plant, and equipment
A summary of costs for property, plant and equipment is as follows:
 
June 30, 2015
 
December 31, 2014
 
(in millions)
Land and improvements
$
37.8

 
$
37.4

Buildings
51.5

 
50.4

Machinery and equipment
2,617.2

 
2,581.2

Automotive equipment
23.4

 
22.1

Furniture and fixtures
19.9

 
19.0

Leasehold improvements
3.4

 
3.4

Aircraft
3.6

 
3.7

Railcars
14.9

 
14.5

Construction in progress
113.7

 
71.5

 
2,885.4

 
2,803.2

Accumulated depreciation
968.9

 
887.2

Total property, plant and equipment, net
$
1,916.5

 
$
1,916.0