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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Taxes [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The items comprising income tax expense are as follows:

Year ended December 31 (In millions)	2014			2013			2012
Provision (Benefit) for Current Income Taxes
Federal	$	—		$	—		$	(9.1	)
State	(4.5		)	4.3			0.5
Total Provision (Benefit) for Current Income Taxes	(4.5		)	4.3			(8.6		)
Provision for Deferred Income Taxes, net
Federal	160.0			154.4			147.3
State	18.2			(26.4		)	(1.5		)
Total Provision for Deferred Income Taxes, net	178.2			128.0			145.8
Deferred Federal Investment Tax Credits, net	(0.9		)	(2.0		)	(2.1		)
Total Income Tax Expense	$	172.8		$	130.3		$	135.1

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The following schedule reconciles the statutory tax rates to the effective income tax rate:

Year ended December 31	2014		2013		2012
Statutory Federal tax rate	35.0	%	35.0	%	35.0	%
Amortization of net unfunded deferred taxes	0.6		0.6		0.8
State income taxes, net of Federal income tax benefit	1.2		0.4		(0.1	)
Federal investment tax credits, net	(0.2	)	(0.4	)	(0.4	)
401(k) dividends	(0.5	)	(0.5	)	(0.5	)
Income attributable to noncontrolling interest	—		(0.3	)	(1.6	)
Federal renewable energy credit (A)	(6.7	)	(7.2	)	(7.2	)
Uncertain tax positions	0.5		1.5		—
Remeasurement of state deferred tax liabilities	0.4		(4.1	)	—
Other	0.1		(0.1	)	—
Effective income tax rate	30.4	%	24.9	%	26.0	%

(A) Represents credits associated with the production from OG&E's wind farms.

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The deferred tax provisions are recognized as costs in the ratemaking process by the commissions having jurisdiction over the rates charged by OG&E. The components of Deferred Income Taxes at December 31, 2014 and 2013, respectively, were as follows:

December 31 (In millions)	2014			2013
Current Deferred Income Tax Assets
Net operating losses	$	158.4		$	180.1
Accrued liabilities	15.6			22.3
Federal tax credits	12.4			8.0
Accrued vacation	4.4			4.7
Uncollectible accounts	0.6			0.7
Total Current Deferred Income Tax Assets	$	191.4		$	215.8
Non-Current Deferred Income Tax Liabilities
Accelerated depreciation and other property related differences	$	1,936.8		$	1,753.3
Investment in Enable Midstream Partners	641.8			630.5
Company pension plan	34.6			55.1
Income taxes refundable to customers, net	21.7			21.9
Regulatory asset	24.7			26.1
Bond redemption-unamortized costs	5.3			3.6
Derivative instruments	1.8			1.6
Total Non-Current Deferred Income Tax Liabilities	2,666.7			2,492.1
Non-Current Deferred Income Tax Assets
Federal tax credits	(139.0		)	(105.2		)
State tax credits	(98.6		)	(92.6		)
Postretirement medical and life insurance benefits	(56.4		)	(62.8		)
Regulatory liabilities	(58.0		)	(61.3		)
Asset retirement obligations	(21.4		)	(20.8		)
Net operating losses	(19.8		)	(18.8		)
Other	(4.8		)	(4.6		)
Deferred Federal investment tax credits	(0.4		)	(0.7		)
Total Non-Current Deferred Income Tax Assets	(398.4		)	(366.8		)
Non-Current Deferred Income Tax Liabilities, net	$	2,268.3		$	2,125.3

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

Following is a reconciliation of the Company’s total gross unrecognized tax benefits as of the years ended December 31, 2014, 2013, and 2012.

(Millions)	2014			2013			2012
Balance at January 1	$	7.8		$	—		$	—
Tax positions related to current year:
Additions	2.7			2.7			—
Tax positions related to prior years:
Additions	—			5.1			—
Balance at December 31	$	10.5		$	7.8		$	—

Summary of Tax Credit Carryforwards [Table Text Block]

The following table summarizes these carry forwards:

(In millions)	Carry Forward Amount			Deferred Tax Asset			Earliest Expiration Date
Net operating losses
State operating loss	$	857.0		$	31.6		2030
Federal operating loss	418.6			146.6			2030
Federal tax credits	151.5			151.4			2029
State tax credits
Oklahoma investment tax credits	115.3			75.1			N/A
Oklahoma capital investment board credits	7.3			7.3			N/A
Oklahoma zero emission tax credits	24.3			16.2			2020

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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