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Report of Business Segments
 3 Months Ended
Mar. 31, 2013
Segment Reporting [Abstract]  
Report of Business Segments
Report of Business Segments

Previously, the Company's business was divided into four segments as follows: (i) electric utility, which is engaged in the generation, transmission, distribution and sale of electric energy, (ii) natural gas transportation and storage, (iii) natural gas gathering and processing and (iv) natural gas marketing. During the third quarter of 2012, the operations and activities of EER were fully integrated with those of Enogex through the creation of a new commodity management organization. The operations of EER, including asset management activities, have been included in the natural gas transportation and storage segment and have been restated for all prior periods presented. As a result of this change, the Company's business is now divided into three segments for financial reporting purposes as follows: (i) electric utility, (ii) natural gas transportation and storage and (iii) natural gas gathering and processing. 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.  In reviewing its segment operating results, the Company focuses on operating income as its measure of segment profit and loss, and, therefore, has presented this information below.  The following tables summarize the results of the Company's business segments during the three months ended March 31, 2013 and 2012.
Three Months Ended
March 31, 2013
 Electric Utility
Natural Gas Transportation and
Storage
Natural Gas Gathering and Processing
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
 
Operating revenues
$
455.5

$
216.4

$
317.9

$
—

$
(88.4
)
$
901.4

Cost of goods sold
213.0

182.7

246.4

—

(89.1
)
553.0

Gross margin on revenues
242.5

33.7

71.5

—

0.7

348.4

Other operation and maintenance
105.1

10.9

34.3

(2.3
)
—

148.0

Depreciation and amortization
61.3

5.8

21.8

3.0

—

91.9

Taxes other than income
23.2

4.8

3.2

1.9

—

33.1

Operating income (loss)
$
52.9

$
12.2

$
12.2

$
(2.6
)
$
0.7

$
75.4

 
 
 
 
 
 
 
Total assets
$
7,138.4

$
2,453.0

$
1,948.9

$
387.2

$
(1,945.7
)
$
9,981.8

Three Months Ended
March 31, 2012
 Electric Utility
Natural Gas Transportation and
Storage
Natural Gas Gathering and Processing
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
 
Operating revenues
$
426.7

$
169.5

$
304.5

$
—

$
(60.0
)
$
840.7

Cost of goods sold
195.5

131.8

217.9

—

(59.9
)
485.3

Gross margin on revenues
231.2

37.7

86.6

—

(0.1
)
355.4

Other operation and maintenance
110.6

12.1

30.1

(5.3
)
0.1

147.6

Depreciation and amortization
59.7

5.6

17.8

3.5

—

86.6

Impairment of assets
—

—

0.2

—

—

0.2

Gain on insurance proceeds
—

—

(7.5
)
—

—

(7.5
)
Taxes other than income
21.1

4.8

2.5

1.8

—

30.2

Operating income (loss)
$
39.8

$
15.2

$
43.5

$
—

$
(0.2
)
$
98.3

 
 
 
 
 
 
 
Total assets
$
6,632.8

$
1,950.3

$
1,574.1

$
257.7

$
(1,340.4
)
$
9,074.5