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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Schedule of segment information
The following table summarizes certain operating results and capital expenditures information by segment:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(in millions)
Net sales
 
 
 
 
 
Petroleum
$
5,161.9

 
$
8,829.7

 
$
8,683.5

Nitrogen Fertilizer
289.2

 
298.7

 
323.7

Intersegment elimination
(18.6
)
 
(18.9
)
 
(21.4
)
Total
$
5,432.5

 
$
9,109.5

 
$
8,985.8

Cost of product sold (exclusive of depreciation and amortization)
 
 
 
 
 
Petroleum
$
4,143.6

 
$
8,013.4

 
$
7,526.7

Nitrogen Fertilizer
65.2

 
72.0

 
58.1

Intersegment elimination
(18.4
)
 
(19.4
)
 
(21.6
)
Total
$
4,190.4

 
$
8,066.0

 
$
7,563.2

Direct operating expenses (exclusive of depreciation and amortization)
 
 
 
 
 
Petroleum
$
478.5

 
$
416.0

 
$
361.7

Nitrogen Fertilizer
106.1

 
98.9

 
94.1

Other
0.1

 
0.2

 
—

Total
$
584.7

 
$
515.1

 
$
455.8

Depreciation and amortization
 
 
 
 
 
Petroleum
$
130.2

 
$
122.5

 
$
114.3

Nitrogen Fertilizer
28.4

 
27.3

 
25.6

Other
5.5

 
4.6

 
2.9

Total
$
164.1

 
$
154.4

 
$
142.8

Operating income
 
 
 
 
 
Petroleum
$
361.7

 
$
207.2

 
$
603.0

Nitrogen Fertilizer
68.7

 
82.8

 
124.9

Other
(8.8
)
 
(25.7
)
 
(17.4
)
Total
$
421.6

 
$
264.3

 
$
710.5

Capital expenditures
 
 
 
 
 
Petroleum
$
194.7

 
$
191.3

 
$
204.5

Nitrogen fertilizer
17.0

 
21.1

 
43.8

Other
7.0

 
6.0

 
8.2

Total
$
218.7

 
$
218.4

 
$
256.5


 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(in millions)
Total assets
 
 
 
 
 
Petroleum
$
2,195.2

 
$
2,417.8

 
$
2,533.3

Nitrogen Fertilizer
536.5

 
578.8

 
593.5

Other
574.1

 
465.9

 
539.0

Total
$
3,305.8

 
$
3,462.5

 
$
3,665.8

Goodwill
 
 
 
 
 
Petroleum
$
—

 
$
—

 
$
—

Nitrogen Fertilizer
41.0

 
41.0

 
41.0

Other
—

 
—

 
—

Total
$
41.0

 
$
41.0

 
$
41.0