Revenue (Tables)

6 Months Ended

Mar. 31, 2022

Revenue From Contract With Customer [Abstract]

Schedule of Revenue Disaggregated by Source and Customer Type

The following tables show revenue disaggregated by source and customer type.

	Three Months Ended March 31,						Six Months Ended March 31,
	2022			2021			2022			2021
Spire
Gas Utility:
Residential	$	687.3		$	537.6		$	1,029.3		$	887.5
Commercial and industrial		85.6			369.2			189.4			472.2
Transportation		33.5			34.2			64.7			66.4
Off-system and other incentive		12.0			130.6			16.8			139.9
Other customer revenue		6.5			(11.9	)		10.1			(9.7	)
Total revenue from contracts with customers		824.9			1,059.7			1,310.3			1,556.3
Changes in accrued revenue under alternative revenue programs		(7.5	)		(6.6	)		10.6			(5.0	)
Total Gas Utility operating revenues		817.4			1,053.1			1,320.9			1,551.3
Gas Marketing		59.4			33.4			107.3			58.2
Other		18.1			15.6			34.7			32.3
Total before eliminations		894.9			1,102.1			1,462.9			1,641.8
Intersegment eliminations (see Note 9, Information by Operating Segment)		(14.0	)		2.8			(26.6	)		(24.3	)
Total Operating Revenues	$	880.9		$	1,104.9		$	1,436.3		$	1,617.5

Spire Missouri
Residential	$	529.1		$	365.4		$	776.2	$	628.4
Commercial and industrial		19.9			304.0			88.1		373.9
Transportation		10.1			9.9			19.3		18.9
Off-system and other incentive		11.3			128.5			15.8		135.9
Other customer revenue		3.6			(17.5	)		5.9		(14.6	)
Total revenue from contracts with customers		574.0			790.3			905.3		1,142.5
Changes in accrued revenue under alternative revenue programs		(2.8	)		0.6			13.8		3.9
Total Operating Revenues	$	571.2		$	790.9		$	919.1	$	1,146.4

Spire Alabama
Residential	$	129.9		$	144.8		$	210.0		$	214.0
Commercial and industrial		51.6			53.2			77.6			77.5
Transportation		20.7			21.7			40.1			42.2
Off-system and other incentive		0.6			1.9			1.0			3.9
Other customer revenue		1.9			3.9			2.7			2.0
Total revenue from contracts with customers		204.7			225.5			331.4			339.6
Changes in accrued revenue under alternative revenue programs		(0.6	)		(2.9	)		(0.7	)		(3.4	)
Total Operating Revenues	$	204.1		$	222.6		$	330.7		$	336.2

Schedule of Gross Receipts Taxes

The expense amounts (shown in the table below) are reported gross in the “Taxes, other than income taxes” line in the statements of income, and corresponding revenues are reported in “Operating Revenues.”

	Three Months Ended March 31,				Six Months Ended March 31,
	2022		2021		2022		2021
Spire	$	51.9	$	42.2	$	73.8	$	63.9
Spire Missouri		39.0		28.6		53.9		43.8
Spire Alabama		11.3		11.8		17.0		17.1