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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The Company's long-term debt is recorded at the carrying amount. The following table summarizes the fair value and carrying amount of the Company's long-term debt at December 31, 2015 and 2014.
 
2015
2014
December 31 (In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Long-Term Debt
 
 
 
 
OG&E Senior Notes
$
2,510.2

$
2,754.6

$
2,509.7

$
2,957.7

OG&E Industrial Authority Bonds
135.4

135.4

135.4

135.4

OG&E Tinker Debt
10.0

9.2

10.2

10.3

OGE Energy Senior Notes
100.0

99.9

100.0

99.9