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Property, Plant, and Equipment (Tables)
 3 Months Ended
Mar. 31, 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:

 
March 31, 2014
 
December 31, 2013
 
(in millions)
Land and improvements
$
36.5

 
$
36.1

Buildings
44.4

 
42.6

Machinery and equipment
2,318.6

 
2,312.5

Automotive equipment
19.5

 
19.2

Furniture and fixtures
19.0

 
18.3

Leasehold improvements
2.5

 
2.5

Aircraft
2.3

 
2.3

Railcars
7.9

 
7.9

Construction in progress
208.3

 
164.9

 
2,659.0

 
2,606.3

Accumulated depreciation
775.0

 
741.9

Total property, plant and equipment, net
$
1,884.0

 
$
1,864.4