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Property, Plant, and Equipment (Tables)
 6 Months Ended
Jun. 30, 2014
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, 2014
 
December 31, 2013
 
(in millions)
Land and improvements
$
36.7

 
$
36.1

Buildings
44.6

 
42.6

Machinery and equipment
2,341.4

 
2,312.5

Automotive equipment
20.0

 
19.2

Furniture and fixtures
19.3

 
18.3

Leasehold improvements
2.8

 
2.5

Aircraft
2.3

 
2.3

Railcars
7.9

 
7.9

Construction in progress
231.7

 
164.9

 
2,706.7

 
2,606.3

Accumulated depreciation
812.5

 
741.9

Total property, plant and equipment, net
$
1,894.2

 
$
1,864.4