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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2016
Property, Plant and Equipment [Abstract]  
Summary of costs for property, plant and equipment
Property, plant and equipment consisted of the following:
 
September 30, 2016
 
December 31, 2015
 
(in millions)
Land and improvements
$
46.4

 
$
38.6

Buildings
64.8

 
53.6

Machinery and equipment
3,617.9

 
2,723.0

Automotive equipment
24.7

 
24.8

Furniture and fixtures
24.9

 
21.3

Leasehold improvements
3.6

 
3.6

Aircraft
3.6

 
3.6

Railcars
16.7

 
16.3

Construction in progress
68.3

 
122.3

 
3,870.9

 
3,007.1

Accumulated depreciation
1,176.2

 
1,040.0

Total property, plant and equipment, net
$
2,694.7

 
$
1,967.1