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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [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 the Company's noncancellable operating lease.  Future minimum payments for noncancellable operating leases are as follows: 
Year ended December 31 (In millions)
2016
2017
2018
2019
2020
After 2020
Total
Operating lease obligations
 
 
 
 
 
 
 
Railcars
$
4.2

$
3.5

$
2.4

$
23.0

$
—

$
—

$
33.1

Wind farm land leases
2.4

2.5

2.5

2.5

2.9

46.3

59.1

Noncancellable operating lease
0.8

0.8

0.7

—

—

—

2.3

Total operating lease obligations
$
7.4

$
6.8

$
5.6

$
25.5

$
2.9

$
46.3

$
94.5



Payments for operating lease obligations were $7.7 million, $6.7 million and $8.8 million for the years ended December 31, 2015, 2014 and 2013, 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)
2016
2017
2018
2019
2020
Total
Other purchase obligations and commitments
 
 
 
 
 
 
Cogeneration capacity and fixed operation and maintenance payments
$
79.8

$
77.0

$
74.0

$
66.6

$
54.7

$
352.1

Expected cogeneration energy payments
58.3

42.7

55.2

57.6

55.1

268.9

Minimum fuel purchase commitments
299.6

127.5

40.7

11.7

—

479.5

Expected wind purchase commitments
58.6

58.8

57.0

55.8

56.6

286.8

Long-term service agreement commitments
2.5

2.6

43.2

2.8

2.9

54.0

Mustang Modernization expenditures
103.4

12.9

17.7

—

—

134.0

Environmental compliance plan expenditures
150.5

119.9

50.8

4.1

—

325.3

Total other purchase obligations and commitments
$
752.7

$
441.4

$
338.6

$
198.6

$
169.3

$
1,900.6
Schedule of Wind Power Purchases [Table Text Block]
The following table summarizes OG&E's wind power purchases for the years ended December 31, 2015, 2014 and 2013. 
Year ended December 31 (In millions)
2015
2014
2013
CPV Keenan
$
26.7

$
28.1

$
30.9

Edison Mission Energy
19.7

21.3

20.6

FPL Energy
3.2

3.6

3.3

NextEra Energy
7.0

7.8

7.2

Total wind power purchased
$
56.6

$
60.8

$
62.0