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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

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)	2017			2018			2019			2020			2021			After 2021			Total
Operating lease obligations
Railcars	$	2.7		$	1.7		$	21.0		$	—		$	—		$	—		$	25.4
Wind farm land leases	2.5			2.5			2.5			2.9			2.9			43.5			56.8
Noncancellable operating lease	0.8			0.7			—			—			—			—			1.5
Total operating lease obligations	$	6.0		$	4.9		$	23.5		$	2.9		$	2.9		$	43.5		$	83.7

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)	2017			2018			2019			2020			2021			Total
Other purchase obligations and commitments
Cogeneration capacity and fixed operation and maintenance payments	$	77.1		$	73.9		$	66.5		$	54.7		$	51.0		$	323.2
Expected cogeneration energy payments	37.7			37.5			38.9			40.7			44.4			199.2
Minimum fuel purchase commitments	236.2			49.3			36.2			24.6			24.6			370.9
Expected wind purchase commitments	59.0			57.9			56.6			57.1			57.5			288.1
Long-term service agreement commitments	2.2			28.4			22.2			2.4			2.4			57.6
Mustang Modernization expenditures	130.4			21.9			—			—			—			152.3
Environmental compliance plan expenditures	169.2			63.0			8.9			0.2			—			241.3
Total other purchase obligations and commitments	$	711.8		$	331.9		$	229.3		$	179.7		$	179.9		$	1,632.6

Schedule of Wind Power Purchases [Table Text Block]

The following table summarizes OG&E's wind power purchases for the years ended December 31, 2016, 2015 and 2014. 

Year ended December 31 (In millions)	2016			2015			2014
CPV Keenan	$	29.2		$	26.7		$	28.1
Edison Mission Energy	21.1			19.7			21.3
FPL Energy	3.4			3.2			3.6
NextEra Energy	7.3			7.0			7.8
Total wind power purchased	$	61.0		$	56.6		$	60.8

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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
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

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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
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25287-109308

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308

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