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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Fair Value and Carrying Amount of PRM Financial Instruments [Table Text Block] | The following table summarizes the carrying amount and fair value of the Company's financial instruments at March 31, 2020 and December 31, 2019.
| March 31, |  | December 31, |  |
| 2020 |  | 2019 |  |
(In millions) | Carrying Amount | Fair Value | Carrying Amount | Fair Value | Classification
Long-term Debt (including Long-term Debt due within one year): |  |  |  |  |
OG&E Senior Notes | $ | 3,050.7 |  | $ | 3,240.1 |  | $ | 3,050.3 |  | $ | 3,500.4 |  | Level 2
OG&E Industrial Authority Bonds | $ | 135.4 |  | $ | 135.4 |  | $ | 135.4 |  | $ | 135.4 |  | Level 2
Tinker Debt | $ | 9.5 |  | $ | 9.7 |  | $ | 9.5 |  | $ | 10.0 |  | Level 3

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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