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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table summarizes the fair value and carrying amount of the Company's long-term debt at March 31, 2016 and December 31, 2015.
 
March 31, 2016
December 31, 2015
(In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Long-Term Debt
 
 
 
 
OG&E Senior Notes
$
2,384.3

$
2,748.1

$
2,493.9

$
2,754.6

OG&E Industrial Authority Bonds
135.4

135.4

135.4

135.4

OG&E Tinker Debt
10.0

9.5

10.0

9.2

OGE Energy Senior Notes
99.6

99.9

99.5

99.9