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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Summary of costs for property, plant, and equipment
The lives used in computing depreciation for such assets are as follows:
Asset
Range of Useful
Lives, in Years
Improvements to land
15 to 30
Buildings
20 to 30
Machinery and equipment
5 to 30
Automotive equipment
5 to 15
Furniture and fixtures
3 to 10
Aircraft
20
Railcars
25 to 40
A summary of costs for property, plant, and equipment is as follows:
 
December 31,
 
2013
 
2012
 
(in millions)
Land and improvements
$
36.1

 
$
31.0

Buildings
42.6

 
40.6

Machinery and equipment
2,312.5

 
2,089.5

Automotive equipment
19.2

 
15.0

Furniture and fixtures
18.3

 
13.7

Leasehold improvements
2.5

 
2.5

Aircraft
2.3

 
—

Railcars
7.9

 
2.5

Construction in progress
164.9

 
189.2

 
2,606.3

 
2,384.0

Accumulated depreciation
741.9

 
601.1

 
$
1,864.4

 
$
1,782.9