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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] | The following table presents the Registrants' future purchase obligations and commitments estimated for the next five years.
(In millions) | 2021 | 2022 | 2023 | 2024 | 2025 | Total
Purchase obligations and commitments: |  |  |  |  |  |
Minimum purchase commitments | $ | 72.5 |  | $ | 50.4 |  | $ | 50.4 |  | $ | 36.7 |  | $ | 25.9 |  | $ | 235.9 |
Expected wind purchase commitments | 55.2 |  | 55.6 |  | 56.0 |  | 56.6 |  | 56.9 |  | 280.3 |
Long-term service agreement commitments | 2.4 |  | 2.4 |  | 7.9 |  | 35.1 |  | 31.2 |  | 79.0 |
Total purchase obligations and commitments | $ | 130.1 |  | $ | 108.4 |  | $ | 114.3 |  | $ | 128.4 |  | $ | 114.0 |  | $ | 595.2 |
Schedule of Wind Power Purchases [Table Text Block] | The following table presents OG&E's wind power purchase contracts.
Company | Location | Original Term of Contract | Expiration of Contract | MWs
CPV Keenan | Woodward County, OK | 20 years | 2030 | 152.0
Edison Mission Energy | Dewey County, OK | 20 years | 2031 | 130.0
NextEra Energy | Blackwell, OK | 20 years | 2032 | 60.0
The following table presents a summary of OG&E's wind power purchases for the years ended December 31, 2020, 2019 and 2018.
Year Ended December 31 (In millions) | 2020 | 2019 | 2018
CPV Keenan | $ | 27.5 |  | $ | 27.2 |  | $ | 27.0 |
Edison Mission Energy | 22.8 |  | 23.1 |  | 21.7 |
NextEra Energy | 7.0 |  | 7.4 |  | 6.8 |
FPL Energy (A) | — |  | — |  | 2.1 |
Total wind power purchased | $ | 57.3 |  | $ | 57.7 |  | $ | 57.6 |
(A)OG&E's purchased power contract with FPL Energy for 50 MWs expired in 2018.

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- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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