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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block] The following table summarizes the carrying amount and fair value of OG&E's financial instruments at March 31, 2020 and December 31, 2019.
 March 31,December 31,
20202019
(In millions)Carrying Amount Fair
Value
Carrying Amount  Fair
Value
Classification
Long-term Debt (including Long-term Debt due within one year):
Senior Notes$3,050.7  $3,240.1  $3,050.3  $3,500.4  Level 2
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