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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Future minimum payments for noncancellable operating leases are as follows: 
Year Ended December 31 (In millions)
2019
2020
2021
2022
2023
After 2023
Total
Operating lease obligations:
 
 
 
 
 
 
 
Railcars
$
18.6

$
—

$
—

$
—

$
—

$
—

$
18.6

Wind farm land leases
2.5

2.9

2.9

2.9

2.9

37.6

51.7

Office space lease
1.0

1.0

0.6

—

—

—

2.6

Total operating lease obligations
$
22.1

$
3.9

$
3.5

$
2.9

$
2.9

$
37.6

$
72.9
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
The Company's other future purchase obligations and commitments estimated for the next five years are as follows: 
(In millions)
2019
2020
2021
2022
2023
Total
Other purchase obligations and commitments:
 
 
 
 
 
 
Cogeneration capacity and fixed operation and maintenance payments (A)
$
10.9

$
—

$
—

$
—

$
—

$
10.9

Expected cogeneration energy payments (A)
2.4

—

—

—

—

2.4

Minimum purchase commitments
75.8

44.6

44.6

44.6

44.6

254.2

Expected wind purchase commitments
56.3

56.9

57.1

57.5

58.0

285.8

Long-term service agreement commitments
46.8

2.4

2.4

2.4

14.4

68.4

Environmental compliance plan expenditures
5.8

0.2

—

—

—

6.0

Total other purchase obligations and commitments
$
198.0

$
104.1

$
104.1

$
104.5

$
117.0

$
627.7


(A)
Cogeneration capacity, fixed operation and maintenance and energy payments will end in 2019, as a result of contract expiration. As described below, OG&E intends to acquire the AES and Oklahoma Cogeneration LLC power plants, pending regulatory approval.
Schedule of Wind Power Purchases [Table Text Block]
OG&E owns the 120 MW Centennial, 101 MW OU Spirit and 228 MW Crossroads wind farms. OG&E's current wind power portfolio also includes purchased power contracts as listed in the table below.
Company
Location
Original Term of Contract
Expiration of Contract
MWs
CPV Keenan
Woodward County, OK
20 years
2030
152.0
Edison Mission Energy
Dewey County, OK
20 years
2031
130.0
NextEra Energy
Blackwell, OK
20 years
2032
60.0

The following table summarizes OG&E's wind power purchases for the years ended December 31, 2018, 2017 and 2016. 
Year Ended December 31 (In millions)
2018
2017
2016
CPV Keenan
$
27.0

$
29.0

$
29.2

Edison Mission Energy
21.7

22.1

21.1

NextEra Energy
6.8

7.4

7.3

FPL Energy (A)
2.1

2.6

3.4

Total wind power purchased
$
57.6

$
61.1

$
61.0


(A)
OG&E's purchased power contract with FPL Energy for 50 MWs expired in 2018.