Note 10 - Information by Operating Segment (Tables)

6 Months Ended

Mar. 31, 2024

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Three Months Ended March 31, 2024
Revenues from external customers	$	1,072.4	$	46.0	$	10.0	$	0.1		$	—		$	1,128.5
Intersegment revenues		0.3		—		11.5		4.0			(15.8	)		—
Total Operating Revenues		1,072.7		46.0		21.5		4.1			(15.8	)		1,128.5
Depreciation and amortization expense		65.4		0.4		3.0		0.1			—			68.9
Interest expense		38.3		—		2.0		22.3			(10.4	)		52.2
Income tax expense (benefit)		41.7		7.6		1.5		(1.4	)		—			49.4
Net economic earnings (loss)		188.0		15.5		3.8		(10.7	)		—			196.6
Capital expenditures		137.3		—		46.0		—			(0.5	)		182.8

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Three Months Ended March 31, 2023
Revenues from external customers	$	1,054.4	$	60.6	$	8.2	$	0.2		$	—		$	1,123.4
Intersegment revenues		0.1		—		8.3		3.9			(12.3	)		—
Total Operating Revenues		1,054.5		60.6		16.5		4.1			(12.3	)		1,123.4
Depreciation and amortization expense		60.2		0.4		2.0		—			—			62.6
Interest expense		35.5		—		1.9		17.0			(7.2	)		47.2
Income tax expense (benefit)		38.9		0.8		1.5		(0.3	)		—			40.9
Net economic earnings (loss)		183.9		21.8		4.2		(10.7	)		—			199.2
Capital expenditures		143.7		—		9.3		—			—			153.0

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Six Months Ended March 31, 2024
Revenues from external customers	$	1,787.6	$	82.3	$	15.0	$	0.2		$	—		$	1,885.1
Intersegment revenues		0.3		—		21.4		8.0			(29.7	)		—
Total Operating Revenues		1,787.9		82.3		36.4		8.2			(29.7	)		1,885.1
Depreciation and amortization		129.6		0.8		5.3		0.2			—			135.9
Interest Expense		77.3		—		3.8		46.3			(24.6	)		102.8
Income tax expense (benefit)		57.4		11.4		2.1		(0.5	)		—			70.4
Net Economic Earnings (Loss)		263.8		22.7		6.2		(13.4	)		—			279.3
Capital expenditures		312.2		—		98.0		—			(0.9	)		409.3

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Six Months Ended March 31, 2023
Revenues from external customers	$	1,787.4	$	134.7	$	15.0	$	0.3		$	—		$	1,937.4
Intersegment revenues		0.1		—		16.7		7.8			(24.6	)		—
Total Operating Revenues		1,787.5		134.7		31.7		8.1			(24.6	)		1,937.4
Depreciation and amortization		119.9		0.7		3.9		0.2			—			124.7
Interest Expense		67.6		—		3.8		36.5			(17.1	)		90.8
Income tax expense (benefit)		51.3		11.3		2.9		(3.0	)		—			62.5
Net Economic Earnings (Loss)		246.8		47.5		8.0		(18.0	)		—			284.3
Capital expenditures		290.0		0.2		17.0		0.6			—			307.8

Reconciliation Of Consolidated Net Economic Earnings To Consolidated Net Income [Table Text Block]

	Three Months Ended March 31,						Six Months Ended March 31,
	2024			2023			2024			2023
Net Income	$	204.3		$	179.2		$	289.4		$	270.2
Adjustments, pre-tax:
Fair value and timing adjustments		(10.2	)		26.6			(15.4	)		18.8
Acquisition activities		—			—			1.9			—
Income tax adjustments		2.5			(6.6	)		3.4			(4.7	)
Net Economic Earnings	$	196.6		$	199.2		$	279.3		$	284.3

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

	March 31,			September 30,			March 31,
	2024			2023			2023
Total Assets:
Gas Utility	$	8,646.3		$	8,486.7		$	8,317.6
Gas Marketing		191.4			332.0			335.0
Midstream		845.2			574.3			506.2
Other		2,467.2			2,533.3			1,959.1
Eliminations		(1,438.7	)		(1,612.7	)		(1,068.9	)
Total Assets	$	10,711.4		$	10,313.6		$	10,049.0