Note 10 - Information by Operating Segment (Tables)

6 Months Ended

Mar. 31, 2023

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, 2023
Operating Revenues:
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
Operating Expenses:
Natural gas		543.3		51.5		—		—			(8.3	)		586.5
Operation and maintenance		119.3		5.7		6.2		4.9			(4.0	)		132.1
Depreciation and amortization		60.2		0.4		2.0		—			—			62.6
Taxes, other than income taxes		80.4		0.6		0.8		0.1			—			81.9
Total Operating Expenses		803.2		58.2		9.0		5.0			(12.3	)		863.1
Operating Income (Loss)	$	251.3	$	2.4	$	7.5	$	(0.9	)	$	—		$	260.3
Net Economic Earnings (Loss)	$	183.9	$	21.8	$	4.2	$	(10.7	)	$	—		$	199.2

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Three Months Ended March 31, 2022
Operating Revenues:
Revenues from external customers	$	817.4	$	59.4	$	4.0	$	0.1		$	—		$	880.9
Intersegment revenues		—		—		9.8		4.2			(14.0	)		—
Total Operating Revenues		817.4		59.4		13.8		4.3			(14.0	)		880.9
Operating Expenses:
Natural gas		356.0		45.8		—		—			(9.8	)		392.0
Operation and maintenance		104.2		3.2		5.8		4.2			(4.2	)		113.2
Depreciation and amortization		56.5		0.4		1.9		0.1			—			58.9
Taxes, other than income taxes		70.3		0.4		0.9		—			—			71.6
Total Operating Expenses		587.0		49.8		8.6		4.3			(14.0	)		635.7
Operating Income	$	230.4	$	9.6	$	5.2	$	—		$	—		$	245.2
Net Economic Earnings (Loss)	$	169.2	$	14.4	$	3.0	$	(5.6	)	$	—		$	181.0

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Six Months Ended March 31, 2022
Operating Revenues:
Revenues from external customers	$	1,320.9	$	107.3	$	7.8	$	0.3		$	—		$	1,436.3
Intersegment revenues		—		—		18.9		7.7			(26.6	)		—
Total Operating Revenues		1,320.9		107.3		26.7		8.0			(26.6	)		1,436.3
Operating Expenses:
Natural gas		566.2		93.8		—		—			(18.8	)		641.2
Operation and maintenance		211.5		5.9		11.6		8.4			(7.8	)		229.6
Depreciation and amortization		111.1		0.7		3.8		0.2			—			115.8
Taxes, other than income taxes		107.3		0.4		1.5		—			—			109.2
Total Operating Expenses		996.1		100.8		16.9		8.6			(26.6	)		1,095.8
Operating Income (Loss)	$	324.8	$	6.5	$	9.8	$	(0.6	)	$	—		$	340.5
Net Economic Earnings (Loss)	$	236.4	$	14.9	$	5.5	$	(13.2	)	$	—		$	243.6

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

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Six Months Ended March 31, 2023
Operating Revenues:
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
Operating Expenses:
Natural gas		944.9		77.5		—		—			(16.7	)		1,005.7
Operation and maintenance		239.2		12.0		12.0		8.9			(7.9	)		264.2
Depreciation and amortization		119.9		0.7		3.9		0.2			—			124.7
Taxes, other than income taxes		130.3		0.7		1.2		0.1			—			132.3
Total Operating Expenses		1,434.3		90.9		17.1		9.2			(24.6	)		1,526.9
Operating Income (Loss)	$	353.2	$	43.8	$	14.6	$	(1.1	)	$	—		$	410.5
Net Economic Earnings (Loss)	$	246.8	$	47.5	$	8.0	$	(18.0	)	$	—		$	284.3

	Three Months Ended March 31,						Six Months Ended March 31,
	2023			2022			2023			2022
Net Income	$	179.2		$	173.6		$	270.2		$	229.3
Adjustments, pre-tax:
Fair value and timing adjustments		26.6			9.9			18.8			13.6
Income tax adjustments		(6.6	)		(2.5	)		(4.7	)		0.7
Net Economic Earnings	$	199.2		$	181.0		$	284.3		$	243.6

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

	March 31,			September 30,			March 31,
	2023			2022			2022
Total Assets:
Gas Utility	$	8,317.6		$	8,042.8		$	7,684.1
Gas Marketing		335.0			638.7			431.1
Midstream		506.2			446.0			420.3
Other		1,959.1			2,449.2			2,123.5
Eliminations		(1,068.9	)		(1,493.0	)		(1,257.7	)
Total Assets	$	10,049.0		$	10,083.7		$	9,401.3