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Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting Information, Additional Information [Abstract]

Segment information included in Consolidated Balance Sheets

Capital Expenditures (a) for the years ended December 31,	2023			2022			2021
Electric Utilities	$	210.7		$	243.1		$	285.8
Gas Utilities		371.9			349.5			383.3
Corporate and Other		7.3			5.1			10.5
Total capital expenditures	$	589.9		$	597.7		$	679.6

(a)Includes accruals for property, plant and equipment as disclosed in the Supplemental Cash Flow Information to the Consolidated Statement of Cash Flows.

Segment information included in Consolidated Statements of Income

Segment information was as follows (in millions):

	Consolidating Income Statement
Year ended December 31, 2023	Electric Utilities			Gas Utilities			Corporate and Other			Total
Revenue -
External Customers	$	853.6		$	1,477.7		$	—		$	2,331.3
Inter-segment		11.4			6.5			(17.9	)		—
Total revenue		865.0			1,484.2			(17.9	)		2,331.3
Fuel, purchased power and cost of natural gas sold		200.1			783.2			(0.4	)		982.9
Operations and maintenance		236.2			328.7			(12.9	)		552.0
Depreciation, depletion and amortization		142.6			113.9			0.3			256.8
Taxes - property and production		37.3			29.6			—			66.9
Operating income (loss)	$	248.8		$	228.8		$	(4.9	)	$	472.7
Interest expense, net											(167.9	)
Other income (expense), net											(3.2	)
Income tax (expense)											(25.6	)
Net income											276.0
Net income attributable to non-controlling interest											(13.8	)
Net income available for common stock										$	262.2

	Consolidating Income Statement
Year ended December 31, 2022	Electric Utilities			Gas Utilities			Corporate and Other			Total
Revenue -
External Customers	$	888.4		$	1,663.4		$	—		$	2,551.8
Inter-segment		11.8			5.7			(17.5	)		—
Total revenue		900.2			1,669.1			(17.5	)		2,551.8
Fuel, purchased power and cost of natural gas sold		266.3			965.1			(0.8	)		1,230.6
Operations and maintenance		244.8			317.3			(13.7	)		548.4
Depreciation, depletion and amortization		135.9			114.7			0.3			250.9
Taxes - property and production		38.9			27.8			—			66.7
Operating income (loss)	$	214.3		$	244.2		$	(3.3	)	$	455.2
Interest expense, net											(161.0	)
Other income (expense), net											1.8
Income tax (expense)											(25.2	)
Net income											270.8
Net income attributable to non-controlling interest											(12.4	)
Net income available for common stock										$	258.4

	Consolidating Income Statement
Year ended December 31, 2021	Electric Utilities			Gas Utilities			Corporate and Other			Total
Revenue -
External Customers	$	830.7		$	1,118.4		$	—		$	1,949.1
Inter-segment		11.5			6.5			(18.0	)		—
Total revenue		842.2			1,124.9			(18.0	)		1,949.1
Fuel, purchased power and cost of natural gas sold		248.0			494.7			(0.8	)		741.9
Operations and maintenance		224.5			290.2			(13.0	)		501.7
Depreciation, depletion and amortization		131.5			104.2			0.3			236.0
Taxes - property and production		35.5			24.6			—			60.1
Operating income (loss)	$	202.7		$	211.2		$	(4.5	)	$	409.4
Interest expense, net											(152.4	)
Other income (expense), net											1.4
Income tax (expense)											(7.2	)
Net income											251.2
Net income attributable to non-controlling interest											(14.5	)
Net income available for common stock										$	236.7

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- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets.

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