Note 15 - Regulatory Matters (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Regulatory Assets and Liabilities [Table Text Block]

	Spire				Spire Missouri				Spire Alabama
September 30	2023		2022		2023		2022		2023		2022
Regulatory Assets:
Current:
Unamortized purchased gas adjustments	$	293.2	$	322.2	$	269.4	$	275.1	$	21.7	$	43.8
Other		55.1		33.2		23.7		13.0		19.9		13.1
Total Current Regulatory Assets		348.3		355.4		293.1		288.1		41.6		56.9
Noncurrent:
Future income taxes due from customers		144.5		137.8		136.2		129.2		2.0		2.2
Pension and postretirement benefit costs		261.0		294.5		189.1		222.9		67.8		66.5
Cost of removal		633.2		493.7		97.0		25.2		536.2		468.5
Unamortized purchased gas adjustments		23.0		—		23.0		—		—		—
Energy efficiency		56.3		57.2		56.3		57.2		—		—
Other		131.2		129.2		116.0		113.1		0.9		1.0
Total Noncurrent Regulatory Assets		1,249.2		1,112.4		617.6		547.6		606.9		538.2
Total Regulatory Assets	$	1,597.5	$	1,467.8	$	910.7	$	835.7	$	648.5	$	595.1
Regulatory Liabilities:
Current:
Other	$	7.3	$	3.7	$	—	$	—	$	—	$	—
Total Current Regulatory Liabilities		7.3		3.7		—		—		—		—
Noncurrent:
Deferred taxes due to customers		128.0		145.3		114.8		127.9		—		—
Pension and postretirement benefit costs		185.2		172.6		156.5		143.6		17.9		19.4
Accrued cost of removal		126.6		32.9		90.4		—		—		—
Unamortized purchased gas adjustments		11.2		53.0		11.2		53.0		—		—
Other		21.4		14.4		16.5		7.3		3.3		3.6
Total Noncurrent Regulatory Liabilities		472.4		418.2		389.4		331.8		21.2		23.0
Total Regulatory Liabilities	$	479.7	$	421.9	$	389.4	$	331.8	$	21.2	$	23.0

Schedule of Regulatory Assets Not Earning Return [Table Text Block]

	Spire				Spire Missouri
September 30	2023		2022		2023		2022
Pension and postretirement benefit costs	$	133.4	$	152.9	$	133.4	$	152.9
Future income taxes due from customers		142.5		135.6		136.2		129.2
Unamortized purchase gas adjustments		292.4		275.1		292.4		275.1
Other		104.2		122.7		104.2		122.7
Total Regulatory Assets Not Earning a Return	$	672.5	$	686.3	$	666.2	$	679.9