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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
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 30
Property, plant and equipment consisted of the following:
 
December 31,
 
2017
 
2016
 
(in millions)
Land and improvements
$
47.4

 
$
46.5

Buildings
83.3

 
64.8

Machinery and equipment
3,733.8

 
3,656.5

Automotive equipment
24.7

 
24.7

Furniture and fixtures
32.4

 
28.9

Leasehold improvements
4.6

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.8

 
16.8

Construction in progress
56.2

 
54.2

 
4,002.8

 
3,899.6

Less: Accumulated depreciation
1,431.0

 
1,227.5

     Total Property, plant and equipment, net
$
2,571.8

 
$
2,672.1