Information by Operating Segment (Tables)

6 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Segment Information by Segment

	Gas Utility		Gas Marketing		Midstream		Other			Eliminations			Consolidated
Three Months Ended March 31, 2025
Revenues from external customers	$	970.1	$	53.6	$	27.1	$	0.5		$	—		$	1,051.3
Intersegment revenues		0.1		—		11.3		4.4			(15.8	)		—
Total Operating Revenues		970.2		53.6		38.4		4.9			(15.8	)		1,051.3
Depreciation and amortization expense		69.5		0.3		3.8		0.1			—			73.7
Interest expense		33.8		—		1.3		24.5			(12.2	)		47.4
Income tax expense (benefit)		45.2		3.3		4.9		(0.7	)		—			52.7
Adjusted earnings (loss)		195.2		14.8		15.8		(11.4	)		—			214.4
Capital expenditures		177.8		—		41.3		—			(0.5	)		218.6

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		41.7		7.6		1.5		(1.4	)		—			49.4
Adjusted 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
Six Months Ended March 31, 2025
Revenues from external customers	$	1,583.6	$	86.6	$	49.4	$	0.8		$	—		$	1,720.4
Intersegment revenues		0.1		—		22.5		8.8			(31.4	)		—
Total Operating Revenues		1,583.7		86.6		71.9		9.6			(31.4	)		1,720.4
Depreciation and amortization expense		137.6		0.7		7.5		0.2			—			146.0
Interest expense		68.9		—		2.5		49.3			(25.3	)		95.4
Income tax expense (benefit)		61.3		4.1		8.7		(1.3	)		—			72.8
Adjusted earnings (loss)		273.0		17.0		27.8		(22.3	)		—			295.5
Capital expenditures		395.7		0.1		84.0		—			(0.6	)		479.2
	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 expense		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
Adjusted earnings (loss)		263.8		22.7		6.2		(13.4	)		—			279.3
Capital expenditures		312.2		—		98.0		—			(0.9	)		409.3

Reconciliation of Adjusted Earnings (Loss) to Net Income (Loss)

The following table reconciles the Company’s adjusted earnings (loss) to net income (loss).

	Three Months Ended March 31,						Six Months Ended  March 31,
	2025			2024			2025			2024
Net Income	$	209.3		$	204.3		$	290.6		$	289.4
Adjustments, pre-tax:
Fair value and timing adjustments		6.9			(10.2	)		6.6			(15.4	)
Acquisition and restructuring activities		—			—			—			1.9
Income tax adjustments		(1.8	)		2.5			(1.7	)		3.4
Adjusted Earnings	$	214.4		$	196.6		$	295.5		$	279.3

Total Assets by Segment

The Company’s total assets by segment were as follows:

	March 31,			September 30,			March 31,
	2025			2024			2024
Total Assets:
Gas Utility	$	9,140.5		$	8,767.2		$	8,646.3
Gas Marketing		276.9			206.1			191.4
Midstream		963.2			903.4			845.2
Other		2,736.9			2,689.8			2,467.2
Eliminations		(1,770.8	)		(1,705.8	)		(1,438.7	)
Total Assets	$	11,346.7		$	10,860.7		$	10,711.4