Information by Operating Segment (Tables)

6 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule of Operating Segment Information

	Gas Utility		Gas Marketing			Other			Eliminations			Consolidated
Three Months Ended March 31, 2021
Operating Revenues:
Revenues from external customers	$	1,053.0	$	47.4		$	4.5		$	—		$	1,104.9
Intersegment revenues		0.1		(14.0	)		11.1			2.8			—
Total Operating Revenues		1,053.1		33.4			15.6			2.8			1,104.9
Operating Expenses:
Natural gas		619.2		(6.2	)		0.1			6.0			619.1
Operation and maintenance		104.0		7.1			11.1			(3.2	)		119.0
Depreciation and amortization		49.5		0.3			1.7			—			51.5
Taxes, other than income taxes		56.4		0.5			1.0			—			57.9
Total Operating Expenses		829.1		1.7			13.9			2.8			847.5
Operating Income	$	224.0	$	31.7		$	1.7		$	—		$	257.4
Net Economic Earnings (Loss)	$	159.7	$	39.8		$	(3.9	)	$	—		$	195.6

	Gas Utility			Gas Marketing			Other			Eliminations			Consolidated
Three Months Ended March 31, 2020
Operating Revenues:
Revenues from external customers	$	679.1		$	33.3		$	3.1		$	—		$	715.5
Intersegment revenues		(0.1	)		—			11.6			(11.5	)		—
Total Operating Revenues		679.0			33.3			14.7			(11.5	)		715.5
Operating Expenses:
Natural gas		271.6			33.6			0.1			(8.2	)		297.1
Operation and maintenance		95.8			3.6			9.6			(3.3	)		105.7
Depreciation and amortization		47.0			0.1			2.1			—			49.2
Taxes, other than income taxes		51.7			0.4			0.9			—			53.0
Total Operating Expenses		466.1			37.7			12.7			(11.5	)		505.0
Operating Income	$	212.9		$	(4.4	)	$	2.0		$	—		$	210.5
Net Economic Earnings (Loss)	$	144.3		$	5.1		$	(5.4	)	$	—		$	144.0

	Gas Utility		Gas Marketing			Other			Eliminations			Consolidated
Six Months Ended March 31, 2021
Operating Revenues:
Revenues from external customers	$	1,550.2	$	58.1		$	9.2		$	—		$	1,617.5
Intersegment revenues		1.1		0.1			23.1			(24.3	)		—
Total Operating Revenues		1,551.3		58.2			32.3			(24.3	)		1,617.5
Operating Expenses:
Natural gas		823.5		(5.5	)		0.1			(17.8	)		800.3
Operation and maintenance		207.0		10.4			19.7			(6.5	)		230.6
Depreciation and amortization		98.1		0.6			3.6			—			102.3
Taxes, other than income taxes		91.9		0.7			1.4			—			94.0
Total Operating Expenses		1,220.5		6.2			24.8			(24.3	)		1,227.2
Operating Income	$	330.8	$	52.0		$	7.5		$	—		$	390.3
Net Economic Earnings (Loss)	$	236.1	$	43.1		$	(6.7	)	$	—		$	272.5
	Gas Utility		Gas Marketing			Other			Eliminations			Consolidated
Six Months Ended March 31, 2020
Operating Revenues:
Revenues from external customers	$	1,209.7	$	65.6		$	7.1		$	—		$	1,282.4
Intersegment revenues		—		—			18.7			(18.7	)		—
Total Operating Revenues		1,209.7		65.6			25.8			(18.7	)		1,282.4
Operating Expenses:
Natural gas		513.1		58.1			0.2			(12.4	)		559.0
Operation and maintenance		204.4		6.7			17.5			(6.3	)		222.3
Depreciation and amortization		93.4		0.1			3.2			—			96.7
Taxes, other than income taxes		89.6		0.7			1.3			—			91.6
Total Operating Expenses		900.5		65.6			22.2			(18.7	)		969.6
Operating Income	$	309.2	$	—		$	3.6		$	—		$	312.8
Net Economic Earnings (Loss)	$	213.4	$	11.2		$	(8.8	)	$	—		$	215.8

	March 31,			September 30,			March 31,
	2021			2020			2020
Total Assets:
Gas Utility	$	7,265.0		$	6,716.2		$	6,311.6
Gas Marketing		341.0			182.7			159.3
Other		2,513.7			2,443.5			2,214.7
Eliminations		(1,182.9	)		(1,101.2	)		(667.6	)
Total Assets	$	8,936.8		$	8,241.2		$	8,018.0

Schedule of Reconciliation of Consolidated Net Economic Earnings to Consolidated Net Income

The following table reconciles the Company’s net economic earnings to net income. For information about the Missouri regulatory adjustment for $9.0 of pension costs in fiscal 2021 and the provision for ISRS rulings in fiscal 2020, see Note 4, Regulatory Matters.

	Three Months Ended March 31,						Six Months Ended March 31,
	2021			2020			2021			2020
Net Income	$	187.4		$	133.6		$	276.3		$	200.6
Adjustments, pre-tax:
Missouri regulatory adjustment		(9.0	)		—			(9.0	)		—
Provision for ISRS rulings		—			2.2			—			4.8
Fair value and timing adjustments		20.1			11.6			4.1			15.3
Income tax effect of adjustments		(2.9	)		(3.4	)		1.1			(4.9	)
Net Economic Earnings	$	195.6		$	144.0		$	272.5		$	215.8