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

 
September 30, 2014
 
December 31, 2013
 
(in millions)
Land and improvements
$
37.2

 
$
36.1

Buildings
44.9

 
42.6

Machinery and equipment
2,410.3

 
2,312.5

Automotive equipment
20.6

 
19.2

Furniture and fixtures
20.0

 
18.3

Leasehold improvements
3.4

 
2.5

Aircraft
2.3

 
2.3

Railcars
7.9

 
7.9

Construction in progress
212.0

 
164.9

 
2,758.6

 
2,606.3

Accumulated depreciation
849.0

 
741.9

Total property, plant and equipment, net
$
1,909.6

 
$
1,864.4