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Report of Business Segments (Tables)
 12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
The following tables summarize the results of the Company's business segments for the years ended December 31, 2014, 2013 and 2012.
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
111.6

69.1

(7.9
)
—

172.8

Net income (loss)
$
292.0

$
102.3

$
1.5

$
—

$
395.8

Investment in unconsolidated affiliates (at historical cost)
$
—

$
1,318.2

$
—

$
—

$
1,318.2

Total assets
$
8,266.2

$
1,461.2

$
129.2

$
(328.8
)
$
9,527.8

Capital expenditures
$
565.4

$
—

$
10.8

$
(6.9
)
$
569.3

2013
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,262.2

$
630.4

$
—

$
(24.9
)
$
2,867.7

Cost of sales
965.9

489.0

—

(26.0
)
1,428.9

Other operation and maintenance
438.8

60.9

(10.5
)
—

489.2

Depreciation and amortization
248.4

36.8

12.1

—

297.3

Taxes other than income
83.8

10.5

4.5

—

98.8

Operating income (loss)
525.3

33.2

(6.1
)
1.1

553.5

Equity in earnings of unconsolidated affiliates
—

101.9

—

—

101.9

Other income (expense)
10.1

8.9

(2.3
)
(0.5
)
16.2

Interest expense
129.3

10.6

8.1

(0.5
)
147.5

Income tax expense
113.5

26.9

(10.6
)
0.5

130.3

Net income (loss)
292.6

106.5

(5.9
)
0.6

393.8

Less: Net income attributable to noncontrolling interests
—

6.6

—

(0.4
)
6.2

Net income attributable to OGE Energy
$
292.6

$
99.9

$
(5.9
)
$
1.0

$
387.6

Investment in unconsolidated affiliates (at historical cost)
$
—

$
1,298.8

$
—

$
—

$
1,298.8

Total assets
$
7,694.9

$
1,348.6

$
216.2

$
(125.0
)
$
9,134.7

Capital expenditures
$
797.6

$
181.5

$
11.5

$
—

$
990.6



2012
Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
2,141.2

$
1,608.6

$
—

$
(78.6
)
$
3,671.2

Cost of sales
879.1

1,120.1

—

(80.5
)
1,918.7

Other operation and maintenance
446.3

172.9

(17.7
)
—

601.5

Depreciation and amortization
248.7

109.2

13.5

—

371.4

Gain on insurance proceeds
—

(7.5
)
—

—

(7.5
)
Taxes other than income
77.7

28.3

4.2

—

110.2

Operating income (loss)
489.4

185.6

—

1.9

676.9

Other income (expense)
10.1

(3.5
)
1.8

(1.1
)
7.3

Interest expense
124.6

32.6

8.0

(1.1
)
164.1

Income tax expense
94.6

45.7

(5.8
)
0.6

135.1

Net income (loss)
280.3

103.8

(0.4
)
1.3

385.0

Less: Net income attributable to noncontrolling interests
—

29.7

—

0.3

30.0

Net income attributable to OGE Energy
$
280.3

$
74.1

$
(0.4
)
$
1.0

$
355.0

Total assets
$
7,222.4

$
2,681.3

$
242.6

$
(224.1
)
$
9,922.2

Capital expenditures
$
704.4

$
506.5

$
18.3

$
—

$
1,229.2