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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule Of Components Of Income Tax Expense

The components of income tax expense (benefit) were as follows:

Year Ended December 31, (in millions)	2018				2017				2016
Income Taxes
Current
Federal	$	—			$	—			$	—
State	8.2				7.8				(0.1		)
Total Current	8.2				7.8				(0.1		)
Deferred
Federal	(209.4		)		302.7				165.6
State	22.2				5.0				18.0
Total Deferred	(187.2		)		307.7				183.6
Deferred Investment Credits	(1.0		)		(1.0		)		(1.4		)
Income Taxes	$	(180.0	)		$	314.5			$	182.1

Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes

Total income taxes were different from the amount that would be computed by applying the statutory federal income tax rate to book income before income tax. The major reasons for this difference were as follows:

Year Ended December 31, (in millions)	2018							2017							2016
Book income (loss) before income taxes	$	(230.6	)					$	443.0						$	513.6
Tax expense (benefit) at statutory federal income tax rate	(48.4		)		21.0	%		155.0				35.0	%		179.8				35.0	%
Increases (reductions) in taxes resulting from:
State income taxes, net of federal income tax benefit	24.7				(10.7	)		6.9				1.5			11.3				2.2
Amortization of regulatory liabilities	(29.3		)		12.7			(2.4		)		(0.5	)		(1.5		)		(0.3	)
Charitable contribution carryover	—				—			(1.2		)		(0.3	)		2.8				0.5
State regulatory proceedings	(127.8		)		55.4			—				—			—				—
Remeasurement due to TCJA	—				—			161.1				36.4			—				—
Employee stock ownership plan dividends and other compensation	(2.2		)		1.0			(6.5		)		(1.5	)		(9.5		)		(1.8	)
Other adjustments	3.0				(1.3	)		1.6				0.4			(0.8		)		(0.1	)
Income Taxes	$	(180.0	)		78.1	%		$	314.5			71.0	%		$	182.1			35.5	%

Schedule Of Principal Components Of Net Deferred Tax Liability

Deferred income taxes result from temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. The principal components of our net deferred tax liability were as follows:

At December 31, (in millions)	2018				2017
Deferred tax liabilities
Accelerated depreciation and other property differences	$	2,458.0			$	2,260.7
Other regulatory assets	375.4				309.5
Total Deferred Tax Liabilities	2,833.4				2,570.2
Deferred tax assets
Other regulatory liabilities and deferred investment tax credits (including TCJA)	365.5				406.0
Pension and other postretirement/postemployment benefits	157.5				136.7
Net operating loss carryforward and AMT credit carryforward	849.8				576.0
Environmental liabilities	24.4				24.0
Other accrued liabilities	37.5				37.2
Other, net	68.2				97.4
Total Deferred Tax Assets	1,502.9				1,277.3
Net Deferred Tax Liabilities	$	1,330.5			$	1,292.9

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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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