Note 7 - Fair Value of Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2023

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

					Classification of Estimated Fair Value
	Carrying Amount		Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)
Spire
As of March 31, 2023
Cash and cash equivalents	$	6.9	$	6.9	$	6.9	$	—
Notes payable		561.0		561.0		—		561.0
Long-term debt, including current portion		3,959.1		3,704.2		—		3,704.2
As of September 30, 2022
Cash and cash equivalents	$	6.5	$	6.5	$	6.5	$	—
Notes payable		1,037.5		1,037.5		—		1,037.5
Long-term debt, including current portion		3,239.7		2,851.8		—		2,851.8
As of March 31, 2022
Cash and cash equivalents	$	8.3	$	8.3	$	8.3	$	—
Notes payable		607.1		607.1		—		607.1
Long-term debt, including current portion		3,238.5		3,299.1		—		3,299.1
Spire Missouri
As of March 31, 2023
Notes payable	$	200.0	$	200.0	$	—	$	200.0
Notes payable – associated companies		60.7		60.7		—		60.7
Long-term debt, including current portion		2,034.5		1,930.2		—		1,930.2
As of September 30, 2022
Notes payable – associated companies	$	445.3	$	445.3	$	—	$	445.3
Long-term debt, including current portion		1,637.7		1,473.9		—		1,473.9
As of March 31, 2022
Notes payable – associated companies	$	277.2	$	277.2	$	—	$	277.2
Long-term debt		1,637.1		1,691.9		—		1,691.9
Spire Alabama
As of March 31, 2023
Cash and cash equivalents	$	1.0	$	1.0	$	1.0	$	—
Notes payable – associated companies		121.3		121.3		—		121.3
Long-term debt		745.7		696.6		—		696.6
As of September 30, 2022
Cash and cash equivalents	$	2.4	$	2.4	$	2.4	$	—
Notes payable – associated companies		260.9		260.9		—		260.9
Long-term debt		571.5		485.0		—		485.0
As of March 31, 2022
Cash and cash equivalents	$	0.2	$	0.2	$	0.2	$	—
Notes payable – associated companies		156.6		156.6		—		156.6
Long-term debt		571.4		588.0		—		588.0