Revenue (Tables)

12 Months Ended

Sep. 30, 2021

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.

	2021			2020			2019
Spire
Gas Utility:
Residential	$	1,234.0		$	1,184.3		$	1,267.3
Commercial & industrial		586.0			383.0			433.9
Transportation		122.9			115.8			112.1
Off-system & other incentive		152.7			38.4			41.9
Other customer revenue		22.2			26.2			22.5
Total revenue from contracts with customers		2,117.8			1,747.7			1,877.7
Changes in accrued revenue under alternative revenue programs		1.5			4.3			(16.9	)
Total Gas Utility operating revenues		2,119.3			1,752.0			1,860.8
Gas Marketing		96.5			87.9			83.7
Other		67.7			57.8			21.5
Total before eliminations		2,283.5			1,897.7			1,966.0
Intersegment eliminations (see Note 14, Information by Operating Segment)		(48.0	)		(42.3	)		(13.6	)
Total Operating Revenues	$	2,235.5		$	1,855.4		$	1,952.4
Spire Missouri
Residential	$	882.1		$	859.6		$	945.9
Commercial & industrial		436.1			241.4			283.8
Transportation		33.5			32.9			33.1
Off-system & other incentive		145.6			35.1			41.9
Other customer revenue		16.3			22.3			—
Total revenue from contracts with customers		1,513.6			1,191.3			1,304.7
Changes in accrued revenue under alternative revenue programs		3.0			2.3			(12.9	)
Total Operating Revenues	$	1,516.6		$	1,193.6		$	1,291.8
Spire Alabama
Residential	$	288.0		$	267.8		$	265.3
Commercial & industrial		114.9			109.4			113.5
Transportation		78.7			72.9			69.5
Off-system & other incentive		7.1			3.2			—
Other customer revenue		1.9			1.9			20.7
Total revenue from contracts with customers		490.6			455.2			469.0
Changes in accrued revenue under alternative revenue programs		3.4			(0.2	)		(3.5	)
Total Operating Revenues	$	494.0		$	455.0		$	465.5

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.”

	2021		2020		2019
Spire	$	94.0	$	91.5	$	99.3
Spire Missouri		64.3		63.5		71.1
Spire Alabama		25.1		23.3		23.7