Note 15 - Regulatory Matters (Tables)

12 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Regulatory Assets and Liabilities [Table Text Block]

	Spire				Spire Missouri				Spire Alabama
September 30	2022		2021		2022		2021		2022		2021
Regulatory Assets:
Current:
Pension and postretirement benefit costs	$	—	$	31.1	$	—	$	21.9	$	—	$	8.2
Unamortized purchased gas adjustments		322.2		243.5		275.1		242.8		43.8		—
Other		33.2		31.9		13.0		11.6		13.1		10.6
Total Current Regulatory Assets		355.4		306.5		288.1		276.3		56.9		18.8
Noncurrent:
Future income taxes due from customers		137.8		132.9		129.2		124.2		2.2		2.2
Pension and postretirement benefit costs		294.5		313.8		222.9		226.0		66.5		82.9
Cost of removal		493.7		431.9		25.2		34.9		468.5		397.0
Energy efficiency		57.2		47.6		57.2		47.6		—		—
Other		129.2		67.3		113.1		50.4		1.0		1.2
Total Noncurrent Regulatory Assets		1,112.4		993.5		547.6		483.1		538.2		483.3
Total Regulatory Assets	$	1,467.8	$	1,300.0	$	835.7	$	759.4	$	595.1	$	502.1
Regulatory Liabilities:
Current:
Pension and postretirement benefit costs	$	—	$	5.8	$	—	$	3.6	$	—	$	2.2
Unamortized purchased gas adjustments		—		11.0		—		—		—		10.2
Other		3.7		17.8		—		13.5		—		1.0
Total Current Regulatory Liabilities		3.7		34.6		—		17.1		—		13.4
Noncurrent:
Deferred taxes due to customers		145.3		127.5		127.9		110.2		—		—
Pension and postretirement benefit costs		172.6		159.3		143.6		131.4		19.4		19.8
Accrued cost of removal		32.9		36.2		—		4.9		—		—
Unamortized purchased gas adjustments		53.0		284.3		53.0		284.3		—		—
Other		14.4		13.6		7.3		8.0		3.6		3.6
Total Noncurrent Regulatory Liabilities		418.2		620.9		331.8		538.8		23.0		23.4
Total Regulatory Liabilities	$	421.9	$	655.5	$	331.8	$	555.9	$	23.0	$	36.8

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

	Spire				Spire Missouri
September 30	2022		2021		2022		2021
Pension and postretirement benefit costs	$	152.9	$	165.7	$	152.9	$	165.7
Future income taxes due from customers		135.6		130.7		129.2		124.2
Unamortized purchase gas adjustments		275.1		242.8		275.1		242.8
Other		122.7		86.0		122.7		86.0
Total Regulatory Assets Not Earning a Return	$	686.3	$	625.2	$	679.9	$	618.7