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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table summarizes the fair value and carrying amount of OG&E's financial instruments at March 31, 2019 and December 31, 2018.
 
March 31, 2019
December 31, 2018
(In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Long-term Debt (including Long-term Debt due within one year):
 
 
 
 
Senior Notes
$
2,752.3

$
2,989.5

$
3,001.9

$
3,178.2

OG&E Industrial Authority Bonds
$
135.4

$
135.4

$
135.4

$
135.4

Tinker Debt
$
9.6

$
9.1

$
9.6

$
8.7