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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of segment information

The following table summarizes certain operating results and capital expenditures information by segment:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(in millions)
Net sales
 
 
 
 
 
Petroleum
$
5,664.2

 
$
4,431.3

 
$
5,161.9

Nitrogen Fertilizer
330.8

 
356.3

 
289.2

Intersegment elimination
(6.6
)
 
(5.2
)
 
(18.6
)
Total
$
5,988.4

 
$
4,782.4

 
$
5,432.5

Cost of materials and other
 
 
 
 
 
Petroleum
$
4,804.7

 
$
3,759.2

 
$
4,143.6

Nitrogen Fertilizer
84.9

 
93.7

 
65.2

Intersegment elimination
(6.7
)
 
(5.4
)
 
(18.4
)
Total
$
4,882.9

 
$
3,847.5

 
$
4,190.4

Direct operating expenses (exclusive of depreciation and amortization)
 
 
 
 
 
Petroleum
$
443.8

 
$
393.4

 
$
478.5

Nitrogen Fertilizer
155.5

 
148.3

 
106.1

Other
0.2

 
0.1

 
0.1

Total
$
599.5

 
$
541.8

 
$
584.7

Depreciation and amortization
 
 
 
 
 
Petroleum
$
133.1

 
$
129.0

 
$
130.2

Nitrogen Fertilizer
74.0

 
58.2

 
28.4

Other
6.9

 
5.9

 
5.5

Total
$
214.0

 
$
193.1

 
$
164.1

Operating income (loss)
 
 
 
 
 
Petroleum
$
203.8

 
$
77.8

 
$
361.7

Nitrogen Fertilizer
(9.2
)
 
26.8

 
68.7

Other
(16.8
)
 
(13.7
)
 
(8.8
)
Total
$
177.8

 
$
90.9

 
$
421.6

Capital expenditures
 
 
 
 
 
Petroleum
$
99.7

 
$
102.3

 
$
194.7

Nitrogen fertilizer
14.5

 
23.2

 
17.0

Other
4.4

 
7.2

 
7.0

Total
$
118.6

 
$
132.7

 
$
218.7


 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(in millions)
Total assets
 
 
 
 
 
Petroleum
$
2,269.9

 
$
2,331.9

 
$
2,189.0

Nitrogen Fertilizer
1,234.3

 
1,312.2

 
536.3

Other
302.5

 
406.1

 
574.1

Total
$
3,806.7

 
$
4,050.2

 
$
3,299.4

Goodwill
 
 
 
 
 
Petroleum
$
—

 
$
—

 
$
—

Nitrogen Fertilizer
41.0

 
41.0

 
41.0

Other
—

 
—

 
—

Total
$
41.0

 
$
41.0

 
$
41.0