Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Operating Lease Obligations

OG&E has operating lease obligations expiring at various dates, primarily forrailcar leases and wind farm land leases. Future minimum payments for noncancellable operating leasesare 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
Total operating lease obligations	$	5.9	$	5.2	$	29.4	$	2.4	$	2.4	$	48.8	$	94.1

Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]

Other Purchase Obligations and Commitments

OG&E'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