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Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

$ 11,908.7

$ 11,185.1

Accumulated Depreciation

3,568.8

3,488.9

Net property, plant and equipment

8,339.9

7,696.2

Capitalized Computer Software, Gross

37.5

37.5

Capitalized Computer Software, Amortization

$ 9.0

$ 9.4

$ 8.9

McClain Plant [Member]

Property, Plant and Equipment [Line Items]

Jointly Owned Utility Plant, Proportionate Ownership Share

77.00%

^[1]

77.00%

^[2]

Property, Plant and Equipment, Gross

$ 226.8

^[1]

$ 234.2

^[2]

Accumulated Depreciation

71.4

^[1]

72.3

^[2]

Net property, plant and equipment

155.4

^[1]

161.9

^[2]

Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress

$ 0.4

$ 0.2

Redbud Plant [Member]

Property, Plant and Equipment [Line Items]

Jointly Owned Utility Plant, Proportionate Ownership Share

51.00%

^[1],[3]

51.00%

^[2],[4]

Property, Plant and Equipment, Gross

$ 496.6

^[1],[3]

$ 489.0

^[2],[4]

Accumulated Depreciation

136.0

^[1],[3]

121.0

^[2],[4]

Net property, plant and equipment

360.6

^[1],[3]

368.0

^[2],[4]

Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress

7.8

1.8

Amount of Acquisition Adjustments

148.3

148.3

Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation

50.8

45.3

OGE Energy [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

6.1

117.7

Accumulated Depreciation

0.0

103.3

Net property, plant and equipment

6.1

14.4

Capitalized Computer Software, Gross

0.0

1.0

Capitalized Computer Software, Amortization

0.2

1.4

2.0

OGE Energy [Member] | Total Property Plant and Equipment [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

6.1

117.7

Accumulated Depreciation

0.0

103.3

Net property, plant and equipment

6.1

14.4

OG&E [Member]

Property, Plant and Equipment [Line Items]

Capitalized Computer Software, Gross

37.5

36.5

Capitalized Computer Software, Amortization

8.8

8.0

$ 6.9

OG&E [Member] | Total Property Plant and Equipment [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

11,902.6

11,067.4

Accumulated Depreciation

3,568.8

3,385.6

Net property, plant and equipment

8,333.8

7,681.8

OG&E [Member] | Electric Transmission and Distribution [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

4,057.1

3,896.2

Accumulated Depreciation

1,259.1

1,221.5

Net property, plant and equipment

2,798.0

2,674.7

OG&E [Member] | Electric Generation Equipment [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

4,475.0

^[5]

4,155.9

^[6]

Accumulated Depreciation

1,493.5

^[5]

1,493.3

^[6]

Net property, plant and equipment

2,981.5

^[5]

2,662.6

^[6]

Amount of Acquisition Adjustments

148.3

148.3

Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation

50.8

45.3

OG&E [Member] | Electric Transmission [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

2,767.7

^[7]

2,548.8

^[8]

Accumulated Depreciation

506.5

^[7]

481.3

^[8]

Net property, plant and equipment

2,261.2

^[7]

2,067.5

^[8]

Amount of Acquisition Adjustments

3.3

3.3

Amount of Acquistion Adjustments Related Accumulated Amortization

0.6

0.6

OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

181.8

85.0

Accumulated Depreciation

135.8

43.9

Net property, plant and equipment

46.0

41.1

OG&E [Member] | Property, Plant and Equipment, Other Types [Member]

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment, Gross

421.0

381.5

Accumulated Depreciation

173.9

145.6

Net property, plant and equipment

$ 247.1

$ 235.9

[1]	Construction work in progress was $0.4 million and $7.8 million for the McClain and Redbud Plants, respectively.
[2]	Construction work in progress was $0.2 million and $1.8 million for the McClain and Redbud Plants, respectively.
[3]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $50.8 million.
[4]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $45.3 million
[5]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $50.8 million.
[6]	This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $45.3 million.
[7]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.6 million.
[8]	This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.6 million

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