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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
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) | 2018 | 2019 | 2020 | 2021 | 2022 | After 2022 | Total
Operating lease obligations: |  |  |  |  |  |  |
Railcars | $ | 1.7 |  | $ | 20.9 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 22.6 |
Wind farm land leases | 2.5 |  | 2.5 |  | 2.9 |  | 2.9 |  | 2.9 |  | 40.6 |  | 54.3 |
Noncancellable operating lease | 0.6 |  | — |  | — |  | — |  | — |  | — |  | 0.6 |
Total operating lease obligations | $ | 4.8 |  | $ | 23.4 |  | $ | 2.9 |  | $ | 2.9 |  | $ | 2.9 |  | $ | 40.6 |  | $ | 77.5 |
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) | 2018 | 2019 | 2020 | 2021 | 2022 | Total
Other purchase obligations and commitments: |  |  |  |  |  |
Cogeneration capacity and fixed operation and maintenance payments | $ | 72.8 |  | $ | 65.3 |  | $ | 53.2 |  | $ | 49.5 |  | $ | 45.4 |  | $ | 286.2 |
Expected cogeneration energy payments | 35.7 |  | 35.6 |  | 35.9 |  | 37.1 |  | 38.3 |  | 182.6 |
Minimum fuel purchase commitments | 139.8 |  | 36.2 |  | 24.6 |  | 24.6 |  | 24.6 |  | 249.8 |
Expected wind purchase commitments | 58.7 |  | 56.5 |  | 56.9 |  | 57.3 |  | 57.8 |  | 287.2 |
Long-term service agreement commitments | 7.9 |  | 41.9 |  | 2.4 |  | 2.4 |  | 2.4 |  | 57.0 |
Mustang Modernization expenditures | 24.9 |  | — |  | — |  | — |  | — |  | 24.9 |
Environmental compliance plan expenditures | 63.0 |  | 8.9 |  | 0.2 |  | — |  | — |  | 72.1 |
Total other purchase obligations and commitments | $ | 402.8 |  | $ | 244.4 |  | $ | 173.2 |  | $ | 170.9 |  | $ | 168.5 |  | $ | 1,159.8 |
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 purchase power contracts with the following:
Company | Location | 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
FPL Energy | Woodward, OK | 15 years | 2018 | 50.0
The following table summarizes OG&E's wind power purchases for the years ended December 31, 2017, 2016 and 2015.
Year Ended December 31 (In millions) | 2017 | 2016 | 2015
CPV Keenan | $ | 29.0 |  | $ | 29.2 |  | $ | 26.7 |
Edison Mission Energy | 22.1 |  | 21.1 |  | 19.7 |
NextEra Energy | 7.4 |  | 7.3 |  | 7.0 |
FPL Energy | 2.6 |  | 3.4 |  | 3.2 |
Total wind power purchased | $ | 61.1 |  | $ | 61.0 |  | $ | 56.6 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25287-109308 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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