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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017 and December 31, 2016.
 
June 30, 2017
December 31, 2016
(In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Long-term Debt (including Long-term Debt due within one year)
 
 
 
 
Senior Notes
$
2,682.8

$
3,008.1

$
2,385.5

$
2,657.2

OG&E Revolving Credit Facility
160.0

160.0

—

—

OG&E Industrial Authority Bonds
135.4

135.4

135.4

135.4

Tinker Debt
9.8

9.6

9.9

9.5