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Report of Business Segments
 12 Months Ended
Dec. 31, 2016
Segment Reporting Information [Line Items]  
Report of Business Segments
Report of Business Segments

The Company reports its operations in two business segments: (i) the electric utility segment, which is engaged in the generation, transmission, distribution and sale of electric energy, and (ii) natural gas midstream operations segment. Other Operations primarily includes the operations of the holding company. 

Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations.

The following tables summarize the results of the Company's business segments for the years ended December 31, 2016, 2015 and 2014.
2016
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,259.2

$
—

$
—

$
—

$
2,259.2

Cost of sales
880.1

—

—

—

880.1

Other operation and maintenance
469.8

7.7

(11.9
)
—

465.6

Depreciation and amortization
316.4

—

6.2

—

322.6

Taxes other than income
84.0

—

3.6

—

87.6

Operating income (loss)
508.9

(7.7
)
2.1

—

503.3

Equity in earnings of unconsolidated affiliates
—

101.8

—

—

101.8

Other income (expense)
27.7

0.1

(4.3
)
(0.2
)
23.3

Interest expense
138.1

—

4.2

(0.2
)
142.1

Income tax expense (benefit)
114.4

40.5

(6.8
)
—

148.1

Net income
$
284.1

$
53.7

$
0.4

$
—

$
338.2

Investment in unconsolidated affiliates
$
—

$
1,158.6

$
—

$
—

$
1,158.6

Total assets
$
8,669.4

$
1,521.6

$
89.0

$
(340.4
)
$
9,939.6

Capital expenditures
$
660.1

$
—

$
—

$
—

$
660.1



2015
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,196.9

$
—

$
—

$
—

$
2,196.9

Cost of sales
865.0

—

—

—

865.0

Other operation and maintenance
444.5

7.5

(0.4
)
—

451.6

Depreciation and amortization
299.9

—

8.0

—

307.9

Taxes other than income
87.1

—

4.1

—

91.2

Operating income (loss)
500.4

(7.5
)
(11.7
)
—

481.2

Equity in earnings of unconsolidated affiliates (A)
—

15.5

—

—

15.5

Other income (expense)
20.0

0.4

0.9

(0.3
)
21.0

Interest expense
146.7

—

2.6

(0.3
)
149.0

Income tax expense (benefit)
104.8

(1.0
)
(6.4
)
—

97.4

Net income
$
268.9

$
9.4

$
(7.0
)
$
—

$
271.3

Investment in unconsolidated affiliates
$
—

$
1,194.4

$
—

$
—

$
1,194.4

Total assets
$
8,525.5

$
1,439.5

$
174.6

$
(559.0
)
$
9,580.6

Capital expenditures
$
551.6

$
—

$
(3.8
)
$
—

$
547.8


(A)
In 2015, The Company recorded a $108.4 million pre-tax charge during the third quarter of 2015 for its share of the goodwill impairment, as adjusted for the basis difference. See Note 3 for further discussion of Enable's goodwill impairment.
2014
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,453.1

$
—

$
—

$
—

$
2,453.1

Cost of sales
1,106.6

—

—

—

1,106.6

Other operation and maintenance
453.2

1.2

(14.8
)
—

439.6

Depreciation and amortization
270.8

—

10.6

—

281.4

Taxes other than income
84.5

—

4.2

—

88.7

Operating income (loss)
538.0

(1.2
)
—

—

536.8

Equity in earnings of unconsolidated affiliates
—

172.6

—

—

172.6

Other income (expense)
7.1

—

0.7

(0.2
)
7.6

Interest expense
141.5

—

7.1

(0.2
)
148.4

Income tax expense (benefit)
111.6

69.1

(7.9
)
—

172.8

Net income
292.0

102.3

1.5

—

395.8

Investment in unconsolidated affiliates
$
—

$
1,318.2

$
—

$
—

$
1,318.2

Total assets
$
8,248.9

$
1,461.2

$
128.6

$
(328.8
)
$
9,509.9

Capital expenditures
$
565.4

$
—

$
10.8

$
(6.9
)
$
569.3