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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes

The following table represents a reconciliation of income tax expense at the statutory federal income tax rate to the actual income tax expense from continuing operations:

Year Ended December 31, (in millions)			2023												2022												2021
Book income before income taxes			$	813.9											$	956.4											$	706.6
Tax expense at statutory federal income tax rate			170.8						21.0		%				200.8						21.0		%				148.3						21.0		%
Increases (reductions) in taxes resulting from:
State income taxes, net of federal income tax benefit			13.7						1.7						4.5						0.5						14.1						2.0
Amortization of regulatory liabilities			(38.2)						(4.7)						(38.5)						(4.0)						(39.1)						(5.5)
Fines and penalties			—						—						0.3						—						—						—
Employee stock ownership plan dividends and other compensation			(1.3)						(0.2)						(1.2)						(0.1)						(1.2)						(0.2)
Tax accrual adjustments			—						—						0.2						—						(0.1)						—
Federal tax credits			(4.9)						(0.6)						(2.3)						(0.2)						(2.1)						(0.3)
Other adjustments			(0.6)						(0.1)						0.8						—						(2.1)						(0.3)
Income Taxes			$	139.5					17.1		%				$	164.6					17.2		%				$	117.8					16.7		%

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 liabilities were as follows:

At December 31, (in millions)			2023						2022
Deferred tax liabilities
Accelerated depreciation and other property differences			$	1,384.8					$	2,473.6
Partnership basis differences			1,241.9						54.3
Other regulatory assets			212.1						348.4
Total Deferred Tax Liabilities			2,838.8						2,876.3
Deferred tax assets
Other regulatory liabilities and deferred investment tax credits (including TCJA)			182.2						294.3
Pension and other postretirement/postemployment benefits			58.6						124.7
Loss and credit carryforwards			422.9						491.0
Environmental liabilities			10.1						20.7
Other accrued liabilities			40.3						55.9
Other, net			50.7						43.0
Total Deferred Tax Assets			764.8						1,029.6
Valuation Allowance			(6.4)						(7.8)
Net Deferred Tax Assets			758.4						1,021.8
Net Deferred Tax Liabilities			$	2,080.4					$	1,854.5

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows:

At December 31, 2023, (in millions)			2023						2022						2021
Opening Balance			$	21.7					$	21.7					$	21.7
Gross decreases - tax positions in prior period			—						—						—
Gross increases - current period tax positions			—						—						—
Ending Balance			$	21.7					$	21.7					$	21.7
Offset for net operating loss carryforwards			(21.7)						(21.7)						(21.7)
Balance, Less Net Operating Loss Carryforwards			$	—					$	—					$	—

Summary of Tax Credit Carryforwards

At December 31, 2023 (in millions)			Deductible Amount						Deferred Tax Asset						Valuation Allowance						Expiration Period
Federal losses			$	1,642.4					$	344.9					$	—					2037
Federal investment tax credits			—						2.1						—						2043
Federal production tax credits			—						0.8						—						2040-2043
Federal other credit			—						15.7						—						2029-2043
State losses, net of federal benefit			2,371.7						95.1						(6.4)						2031-2037
Total									$	458.6					$	(6.4)

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