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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block] The following table summarizes the carrying amount and fair value of the Company's financial instruments at December 31, 2019 and 2018, as well as the classification level within the fair value hierarchy.
 20192018
December 31 (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$3,050.3  $3,500.4  $3,001.9  $3,178.2  Level 2  
OG&E Industrial Authority Bonds$135.4  $135.4  $135.4  $135.4  Level 2  
Tinker Debt$9.5  $10.0  $9.6  $8.7  Level 3