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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2014
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,
 
2014
 
2013
 
(in millions)
Land and improvements
$
37.4

 
$
36.1

Buildings
50.4

 
42.6

Machinery and equipment
2,581.2

 
2,312.5

Automotive equipment
22.1

 
19.2

Furniture and fixtures
19.0

 
18.3

Leasehold improvements
3.4

 
2.5

Aircraft
3.7

 
2.3

Railcars
14.5

 
7.9

Construction in progress
71.5

 
164.9

 
2,803.2

 
2,606.3

Accumulated depreciation
887.2

 
741.9

 
$
1,916.0

 
$
1,864.4