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v3.19.3.a.u2

Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | $ 12,912.7 |  | $ 12,371.2 |  |
Accumulated Depreciation | 3,868.1 |  | 3,727.4 |  |
Net property, plant and equipment | 9,044.6 |  | 8,643.8 |  |
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation | 61.8 |  | 56.3 |  |
Capitalized Computer Software, Amortization | $ 11.0 |  | $ 9.6 |  | $ 9.0
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 | $ 254.4 | [1] | $ 227.2 | [2] |
Accumulated Depreciation | 83.5 | [1] | 78.2 | [2] |
Net property, plant and equipment | 170.9 | [1] | 149.0 | [2] |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | $ 0.2 |  | $ 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 | $ 529.9 | [1],[3] | $ 493.9 | [2],[4] |
Accumulated Depreciation | 159.0 | [1],[3] | 145.3 | [2],[4] |
Net property, plant and equipment | 370.9 | [1],[3] | 348.6 | [2],[4] |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | 1.4 |  | 0.9 |  |
Amount of Acquisition Adjustments | 148.3 |  | 148.3 |  |
OGE Energy [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 6.1 |  | 6.1 |  |
Accumulated Depreciation | 0.0 |  | 0.0 |  |
Net property, plant and equipment | 6.1 |  | 6.1 |  |
Capitalized Computer Software, Amortization | 0.0 |  | 0.0 |  | 0.2
OGE Energy [Member] | Total Property Plant and Equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 6.1 |  | 6.1 |  |
Accumulated Depreciation | 0.0 |  | 0.0 |  |
Net property, plant and equipment | 6.1 |  | 6.1 |  |
OG&E [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Capitalized Computer Software, Gross | 71.3 |  | 44.3 |  |
Capitalized Computer Software, Amortization | 11.0 |  | 9.6 |  | $ 8.8
OG&E [Member] | Total Property Plant and Equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 12,906.6 |  | 12,365.1 |  |
Accumulated Depreciation | 3,868.1 |  | 3,727.4 |  |
Net property, plant and equipment | 9,038.5 |  | 8,637.7 |  |
OG&E [Member] | Electric Transmission and Distribution [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 4,468.6 |  | 4,229.4 |  |
Accumulated Depreciation | 1,381.1 |  | 1,324.5 |  |
Net property, plant and equipment | 3,087.5 |  | 2,904.9 |  |
OG&E [Member] | Electric Generation Equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 4,838.6 | [5] | 4,657.2 | [6] |
Accumulated Depreciation | 1,601.0 | [5] | 1,572.8 | [6] |
Net property, plant and equipment | 3,237.6 | [5] | 3,084.4 | [6] |
Amount of Acquisition Adjustments | 148.3 |  | 148.3 |  |
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation | 61.8 |  | 56.3 |  |
OG&E [Member] | Electric Transmission [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 2,901.1 | [7] | 2,846.7 | [8] |
Accumulated Depreciation | 565.5 | [7] | 534.2 | [8] |
Net property, plant and equipment | 2,335.6 | [7] | 2,312.5 | [8] |
Amount of Acquisition Adjustments | 3.3 |  | 3.3 |  |
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments, Related Accumulated Depreciation | 0.8 |  | 0.7 |  |
OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 225.2 |  | 187.6 |  |
Accumulated Depreciation | 145.4 |  | 135.1 |  |
Net property, plant and equipment | 79.8 |  | 52.5 |  |
OG&E [Member] | Property, Plant and Equipment, Other Types [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 473.1 |  | 444.2 |  |
Accumulated Depreciation | 175.1 |  | 160.8 |  |
Net property, plant and equipment | $ 298.0 |  | $ 283.4 |  |
[1] | Construction work in progress was $0.2 million and $1.4 million for the McClain and Redbud Plants, respectively.
[2] | Construction work in progress was $0.2 million and $0.9 million for the McClain and Redbud Plants, respectively.
[3] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $61.8 million.
[4] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $56.3 million.
[5] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $61.8 million.
[6] | This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $56.3 million.
[7] | This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.8 million.
[8] | This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.7 million.

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