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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 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 September 30, 2020 and December 31, 2019.
 September 30,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$3,349.0 $4,116.5 $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 $10.6 $9.5 $10.0 Level 3