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Property, Plant, and Equipment (Tables)
 9 Months Ended
Sep. 30, 2013
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:

 
September 30, 2013
 
December 31, 2012
 
(in millions)
Land and improvements
$
34.0

 
$
31.0

Buildings
42.5

 
40.6

Machinery and equipment
2,284.8

 
2,089.5

Automotive equipment
16.7

 
15.0

Furniture and fixtures
14.7

 
13.7

Leasehold improvements
2.5

 
2.5

Aircraft
2.2

 
—

Railcars
8.0

 
2.5

Construction in progress
134.8

 
189.2

 
2,540.2

 
2,384.0

Accumulated depreciation
705.5

 
601.1

Total property, plant and equipment, net
$
1,834.7

 
$
1,782.9