Revenue (Tables)

6 Months Ended

Mar. 31, 2020

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,
	2020			2019			2020			2019
Spire
Gas Utility:
Residential	$	471.9		$	551.3		$	840.3		$	944.9
Commercial & industrial		156.8			185.9			279.3			316.2
Transportation		32.5			31.3			63.5			60.8
Off-system & other incentive		9.3			11.5			18.7			26.4
Other customer revenue		3.2			10.9			5.6			23.6
Total revenue from contracts with customers		673.7			790.9			1,207.4			1,371.9
Changes in accrued revenue under alternative revenue programs		5.3			(14.1	)		2.3			(19.9	)
Total Gas Utility operating revenues		679.0			776.8			1,209.7			1,352.0
Gas Marketing:
Revenue from contracts with retail customers		33.3			25.5			65.6			51.3
Revenue from wholesale derivative contracts		—			—			—			—
Total Gas Marketing operating revenues		33.3			25.5			65.6			51.3
Other		14.7			4.3			25.8			9.7
Total before eliminations		727.0			806.6			1,301.1			1,413.0
Intersegment eliminations (see Note 9, Information by Operating Segment)		(11.5	)		(3.1	)		(18.7	)		(7.5	)
Total Operating Revenues	$	715.5		$	803.5		$	1,282.4		$	1,405.5

Spire Missouri
Residential	$	331.1	$	410.9		$	607.0	$	713.0
Commercial & industrial		99.2		129.2			180.0		218.3
Transportation		9.7		9.9			18.7		18.9
Off-system & other incentive		9.3		11.5			18.7		26.4
Other customer revenue		0.9		4.2			1.4		6.8
Total revenue from contracts with customers		450.2		565.7			825.8		983.4
Changes in accrued revenue under alternative revenue programs		7.3		(9.1	)		5.7		(13.6	)
Total Operating Revenues	$	457.5	$	556.6		$	831.5	$	969.8

Spire Alabama
Residential	$	120.5		$	116.9		$	194.8		$	192.3
Commercial & industrial		46.2			44.1			77.5			75.5
Transportation		19.9			18.8			39.5			37.0
Other customer revenue		1.7			5.3			3.3			14.9
Total revenue from contracts with customers		188.3			185.1			315.1			319.7
Changes in accrued revenue under alternative revenue programs		(2.8	)		(4.7	)		(3.4	)		(5.8	)
Total Operating Revenues	$	185.5		$	180.4		$	311.7		$	313.9

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,
	2020		2019		2020		2019
Spire	$	37.9	$	43.5	$	62.5	$	69.4
Spire Missouri		26.2		32.1		43.4		50.6
Spire Alabama		9.9		9.6		16.1		15.9