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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Taxes [Abstract]

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

The items comprising income tax (benefit) expense are as follows:

Year Ended December 31 (In millions)	2017			2016			2015
Provision (benefit) for current income taxes:
Federal	$	4.9		$	—		$	—
State	(4.2		)	(5.7		)	(5.2		)
Total provision (benefit) for current income taxes	0.7			(5.7		)	(5.2		)
(Benefit) provision for deferred income taxes, net:
Federal	(75.9		)	126.0			98.8
State	26.0			28.0			4.5
Total (benefit) provision for deferred income taxes, net	(49.9		)	154.0			103.3
Deferred federal investment tax credits, net	(0.1		)	(0.2		)	(0.7		)
Total income tax (benefit) expense	$	(49.3	)	$	148.1		$	97.4

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	2017		2016		2015
Statutory federal tax rate	35.0	%	35.0	%	35.0	%
Federal deferred tax revaluation	(41.2	)	—		—
Federal renewable energy credit (A)	(4.8	)	(6.8	)	(8.9	)
401(k) dividends	(0.5	)	(0.6	)	(0.7	)
Federal investment tax credits, net	(0.1	)	(0.8	)	(0.2	)
Other	(0.1	)	0.1		0.3
State income taxes, net of federal income tax benefit	2.0		1.9		0.1
Amortization of net unfunded deferred taxes	0.7		0.7		0.9
Remeasurement of state deferred tax liabilities	0.4		0.9		(0.8	)
Uncertain tax positions	—		0.1		0.7
Effective income tax rate	(8.6	)%	30.5	%	26.4	%

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

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

The components of Deferred Income Taxes at December 31, 2017 and 2016 were as follows:

December 31 (In millions)	2017			2016
Deferred income tax liabilities, net:
Accelerated depreciation and other property related differences	$	1,449.6		$	2,103.2
Investment in Enable Midstream Partners	441.7			657.3
Regulatory asset	18.9			34.4
Company Pension Plan	11.5			16.5
Bond redemption-unamortized costs	2.6			4.3
Derivative instruments	1.6			2.2
Income taxes (recoverable from) refundable to customers, net	(244.3		)	24.1
Federal tax credits	(218.5		)	(220.6		)
State tax credits	(141.7		)	(112.2		)
Postretirement medical and life insurance benefits	(25.2		)	(48.9		)
Net operating losses	(21.1		)	(31.7		)
Asset retirement obligations	(19.2		)	(24.5		)
Regulatory liabilities	(16.8		)	(34.6		)
Accrued liabilities	(7.4		)	(16.1		)
Accrued vacation	(2.1		)	(3.5		)
Other	(0.9		)	(14.0		)
Deferred federal investment tax credits	(0.5		)	(0.8		)
Uncollectible accounts	(0.4		)	(0.6		)
Total deferred income tax liabilities, net	$	1,227.8		$	2,334.5

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, 2017, 2016 and 2015.

(In millions)	2017			2016			2015
Balance at January 1	$	20.7		$	20.2		$	16.1
Tax positions related to current year:
Additions	—			0.5			4.1
Balance at December 31	$	20.7		$	20.7		$	20.2

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
State operating loss	$	472.1		$	21.1		2030
Federal tax credits	218.5			218.5			2029
State tax credits:
Oklahoma investment tax credits	144.1			113.8			N/A
Oklahoma capital investment board credits	8.5			8.5			N/A
Oklahoma zero emission tax credits	24.1			19.4			2020

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Income Taxes [Abstract]

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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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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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Tabular disclosure of tax credit carryforwards available to reduce future taxable income, including amounts, expiration dates, limitations on use and the related deferred tax assets and valuation allowances.

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