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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30, 2018 and December 31, 2017.
 
September 30, 2018
December 31, 2017
(In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Long-term Debt (including Long-term Debt due within one year):
 
 
 
 
Senior Notes
$
3,001.6

$
3,125.9

$
2,854.3

$
3,242.8

OG&E Industrial Authority Bonds
$
135.4

$
135.4

$
135.4

$
135.4

Tinker Debt
$
9.7

$
8.7

$
9.7

$
9.8