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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Operating Lease Obligations
The Company has operating lease obligations expiring at various dates, primarily for OG&E railcar leases, OG&E wind farm land leases and OGE Energy noncancellable operating lease.  Future minimum payments for noncancellable operating leases are as follows: 
Year ended December 31 (In millions)
2014
2015
2016
2017
2018
After 2018
Total
Operating lease obligations
 
 
 
 
 
 
 
Railcars
$
3.8

$
3.1

$
27.3

$
—

$
—

$
—

$
34.2

Wind farm land leases
2.1

2.1

2.1

2.4

2.4

48.8

59.9

OGE Energy noncancellable operating lease
0.8

0.8

0.8

0.8

0.7

—

3.9

Total operating lease obligations
$
6.7

$
6.0

$
30.2

$
3.2

$
3.1

$
48.8

$
98.0



Payments for operating lease obligations were $8.8 million, $14.2 million and $10.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
Other Purchase Obligations and Commitments
 
The Company's other future purchase obligations and commitments estimated for the next five years are as follows: 
(In millions)
2014
2015
2016
2017
2018
Total
Other purchase obligations and commitments
 
 
 
 
 
 
Cogeneration capacity and fixed operation and maintenance payments
$
85.1

$
82.7

$
81.9

$
79.6

$
77.0

$
406.3

Expected cogeneration energy payments
61.1

60.9

75.7

81.5

87.4

366.6

Minimum fuel purchase commitments
451.8

451.8

368.5

385.1

—

1,657.2

Expected wind purchase commitments
58.0

58.9

59.8

60.8

59.5

297.0

Long-term service agreement commitments
70.5

2.8

2.5

2.6

19.1

97.5

Total other purchase obligations and commitments
$
726.5

$
657.1

$
588.4

$
609.6

$
243.0

$
2,824.6
Schedule of Wind Power Purchases [Table Text Block]
The following table summarizes OG&E's wind power purchases for the years ended December 31, 2013, 2012 and 2011. 
Year ended December 31 (In millions)
2013
2012
2011
CPV Keenan
$
30.9

$
25.1

$
24.5

Edison Mission Energy
20.6

20.2

8.5

FPL Energy
3.3

3.4

3.7

NextEra Energy
7.2

0.8

—

Total wind power purchased
$
62.0

$
49.5

$
36.7