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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following tables present the details of AROs which are included on the accompanying Consolidated Balance Sheets in Other deferred credits and other liabilities (in millions):


	December 31, 2022			Liabilities Incurred			Liabilities Settled			Accretion			Revisions to Prior Estimates			December 31, 2023
Electric Utilities	$	27.6		$	—		$	—		$	1.2		$	(0.1	)	$	28.7
Gas Utilities (a)		61.3			6.7			—			2.3			(2.8	)		67.5
Total	$	88.9		$	6.7		$	—		$	3.5		$	(2.9	)	$	96.2


	December 31, 2021			Liabilities Incurred			Liabilities Settled			Accretion			Revisions to Prior Estimates			December 31, 2022
Electric Utilities	$	30.1		$	—		$	(3.0	)	$	1.4		$	(0.9	)	$	27.6
Gas Utilities (a)		45.5			—			(0.2	)		2.0			14.0			61.3
Total	$	75.6		$	—		$	(3.2	)	$	3.4		$	13.1		$	88.9

(a)

The Revisions to Prior Estimates were primarily driven by changes in estimates associated with natural gas wells and compressor stations.