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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Summary of property, plant and equipment
Property, plant and equipment consisted of the following:
 
September 30, 2017
 
December 31, 2016
 
(in millions)
Land and improvements
$
47.0

 
$
46.5

Buildings
83.7

 
64.8

Machinery and equipment
3,686.0

 
3,656.5

Automotive equipment
25.1

 
24.7

Furniture and fixtures
31.1

 
28.9

Leasehold improvements
4.7

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.8

 
16.8

Construction in progress
69.3

 
54.2

 
3,967.3

 
3,899.6

Accumulated depreciation
1,380.8

 
1,227.5

Total property, plant and equipment, net
$
2,586.5

 
$
2,672.1