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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment Depreciation is computed using the straight-line method over management's estimated useful lives of the related assets, which are as follows:
 
Years
Building and building improvements
15-40
Refinery machinery and equipment
5-40
Pipelines and terminals
15-40
Retail store equipment and site improvements
7-40
Refinery turnaround costs
4-6
Automobiles
3-5
Computer equipment and software
3-10
Furniture and fixtures
5-15
Asset retirement obligation assets
15-50
Property, plant and equipment, at cost, consist of the following (in millions):
 
 
December 31,
 
 
2018
 
2017
Land
 
$
66.2

 
$
54.0

Building and building improvements
 
108.7

 
67.9

Refinery machinery and equipment
 
1,801.8

 
1,823.4

Pipelines and terminals
 
412.2

 
314.3

Retail store equipment and site improvements
 
37.8

 
75.5

Refinery turnaround costs
 
166.9

 
124.8

Other equipment
 
124.9

 
108.2

Construction in progress
 
281.1

 
204.4

 
 
$
2,999.6

 
2,772.5

Less: accumulated depreciation
 
(804.7
)
 
(631.7
)
 
 
$
2,194.9

 
$
2,140.8

Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment are as follows (in millions):
 
 
As of and For the Year Ended December 31, 2018
 
 
Refining
 
Logistics
 
Retail
 
Corporate,
Other and Eliminations
 
Consolidated
Property, plant and equipment
 
$
2,230.6

 
$
452.7

 
$
146.5

 
$
169.8

 
$
2,999.6

Less: Accumulated depreciation
 
(584.2
)
 
(140.2
)
 
(29.3
)
 
(51.0
)
 
(804.7
)
Property, plant and equipment, net
 
$
1,646.4

 
$
312.5

 
$
117.2

 
$
118.8

 
$
2,194.9

Depreciation expense
 
$
124.2

 
$
25.9

 
$
23.8

 
$
15.1

 
$
189.0

    
 
 
As of and For the Year Ended December 31, 2017
 
 
Refining
 
Logistics
 
Retail
 
Corporate,
Other and Eliminations
 
Consolidated
Property, plant and equipment
 
$
2,112.2

 
$
367.2

 
$
141.9

 
$
151.2

 
$
2,772.5

Less: Accumulated depreciation
 
(474.8
)
 
(112.1
)
 
(6.7
)
 
(38.1
)
 
(631.7
)
Property, plant and equipment, net
 
$
1,637.4

 
$
255.1

 
$
135.2

 
$
113.1

 
$
2,140.8

Depreciation expense
 
$
106.8

 
$
20.9

 
$
6.6

 
$
15.2

 
$
149.5