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Report of Business Segments
 12 Months Ended
Dec. 31, 2012
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 for the years ended December 31, 2012, 2011 and 2010.
2012
 Electric Utility
Natural Gas Transportation and
Storage
Natural Gas Gathering and Processing
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
 
Operating revenues
$
2,141.2

$
639.5

$
1,222.6

$
—

$
(332.1
)
$
3,671.2

Cost of goods sold
879.1

504.9

868.7

—

(334.0
)
1,918.7

Gross margin on revenues
1,262.1

134.6

353.9

—

1.9

1,752.5

Other operation and maintenance
446.3

49.8

123.1

(17.7
)
—

601.5

Depreciation and amortization
248.7

24.0

84.8

13.5

—

371.0

Impairment of assets
—

—

0.4

—

—

0.4

Gain on insurance proceeds
—

—

(7.5
)
—

—

(7.5
)
Taxes other than income
77.7

15.7

12.6

4.2

—

110.2

Operating income (loss)
$
489.4

$
45.1

$
140.5

$
—

$
1.9

$
676.9

 
 
 
 
 
 
 
Total assets
$
7,222.4

$
2,330.8

$
1,868.6

$
272.6

$
(1,772.2
)
$
9,922.2

Capital expenditures (A)
$
704.4

$
32.0

$
475.4

$
18.3

$
(0.9
)
$
1,229.2

(A)
Includes $78.6 million related to the acquisition of certain gas gathering assets as discussed in Note 3.
2011
 Electric Utility
Natural Gas Transportation and
Storage
Natural Gas Gathering and Processing
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
 
Operating revenues
$
2,211.5

$
880.1

$
1,167.1

$
—

$
(342.8
)
$
3,915.9

Cost of goods sold
1,013.5

736.0

870.7

—

(342.3
)
2,277.9

Gross margin on revenues
1,198.0

144.1

296.4

—

(0.5
)
1,638.0

Other operation and maintenance
436.0

50.7

111.8

(17.3
)
—

581.2

Depreciation and amortization
216.1

22.0

55.6

13.4

—

307.1

Impairment of assets
—

—

6.3

—

—

6.3

Gain on insurance proceeds
—

—

(3.0
)
—

—

(3.0
)
Taxes other than income
73.6

15.0

7.0

4.1

—

99.7

Operating income (loss)
$
472.3

$
56.4

$
118.7

$
(0.2
)
$
(0.5
)
$
646.7

 
 
 
 
 
 
 
Total assets
$
6,620.9

$
1,836.9

$
1,483.8

$
166.6

$
(1,202.2
)
$
8,906.0

Capital expenditures (A)
$
844.5

$
41.1

$
572.0

$
13.8

$
(0.6
)
$
1,470.8

(A)
Includes $200.4 million related to the acquisition of certain gas gathering assets as discussed in Note 3.
2010
 Electric Utility
Natural Gas Transportation and
Storage
Natural Gas Gathering and Processing
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
 
Operating revenues
$
2,109.9

$
984.8

$
1,005.6

$
—

$
(383.4
)
$
3,716.9

Cost of goods sold
1,000.2

834.5

733.3

—

(380.6
)
2,187.4

Gross margin on revenues
1,109.7

150.3

272.3

—

(2.8
)
1,529.5

Other operation and maintenance
418.1

53.8

91.5

(13.6
)
—

549.8

Depreciation and amortization
208.7

21.2

50.1

11.3

—

291.3

Impairment of assets
—

0.7

0.4

—

—

1.1

Taxes other than income
69.2

14.2

6.4

3.6

—

93.4

Operating income (loss)
$
413.7

$
60.4

$
123.9

$
(1.3
)
$
(2.8
)
$
593.9

 
 
 
 
 
 
 
Total assets
$
5,898.1

$
1,316.6

$
973.8

$
135.4

$
(654.8
)
$
7,669.1

Capital expenditures
$
631.6

$
72.6

$
164.0

$
14.1

$
(2.4
)
$
879.9