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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

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 OGE Energy noncancellable operating lease.  Future minimum payments for noncancellable operating leases are as follows:

Year ended December 31 (In millions)	2015			2016			2017			2018			2019			After 2019			Total
Operating lease obligations
Railcars	$	4.5		$	28.7		$	1.0		$	—		$	—		$	—		$	34.2
Wind farm land leases	2.1			2.1			2.4			2.4			2.4			46.4			57.8
OGE Energy noncancellable operating lease	0.8			0.8			0.8			0.7			—			—			3.1
Total operating lease obligations	$	7.4		$	31.6		$	4.2		$	3.1		$	2.4		$	46.4		$	95.1

Payments for operating lease obligations were $6.7 million, $8.8 million and $14.2 million for the years ended December 31, 2014, 2013 and 2012, 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)	2015			2016			2017			2018			2019			Total
Other purchase obligations and commitments
Cogeneration capacity and fixed operation and maintenance payments	$	85.2		$	83.3		$	80.7		$	77.8		$	70.6		$	397.6
Expected cogeneration energy payments	74.4			78.5			81.2			89.7			85.1			408.9
Minimum fuel purchase commitments	389.3			246.6			43.6			—			—			679.5
Expected wind purchase commitments	58.4			59.3			60.3			59.1			58.4			295.5
Long-term service agreement commitments	2.5			2.6			2.7			19.4			27.5			54.7
Environmental compliance plan expenditures	66.5			138.1			117.6			50.1			3.9			376.2
Total other purchase obligations and commitments	$	676.3		$	608.4		$	386.1		$	296.1		$	245.5		$	2,212.4

Schedule of Wind Power Purchases [Table Text Block]

The following table summarizes OG&E's wind power purchases for the years ended December 31, 2014, 2013 and 2012. 

Year ended December 31 (In millions)	2014			2013			2012
CPV Keenan	$	28.1		$	30.9		$	25.1
Edison Mission Energy	21.3			20.6			20.2
FPL Energy	3.6			3.3			3.4
NextEra Energy	7.8			7.2			0.8
Total wind power purchased	$	60.8		$	62.0		$	49.5

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Schedule of Wind Power Purchases [Table Text Block]

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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

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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

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-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308



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