XML 27 R30.htm IDEA: XBRL DOCUMENT v3.20.1
Fair Value Measurements (Tables)
3 Months Ended
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,
 20202019
(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