Note 7 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Jun. 30, 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 June 30, 2023
Cash and cash equivalents	$	5.3	$	5.3	$	5.3	$	—
Notes payable		557.6		557.6		—		557.6
Long-term debt, including current portion		3,959.9		3,650.7		—		3,650.7
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 June 30, 2022
Cash and cash equivalents	$	16.0	$	16.0	$	16.0	$	—
Notes payable		709.2		709.2		—		709.2
Long-term debt, including current portion		3,239.1		3,032.1		—		3,032.1
Spire Missouri
As of June 30, 2023
Notes payable – associated companies	$	228.1	$	228.1	$	—	$	228.1
Long-term debt, including current portion		2,035.1		1,890.2		—		1,890.2
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 June 30, 2022
Cash and cash equivalents	$	7.0	$	7.0	$	7.0	$	—
Notes payable – associated companies		285.4		285.4		—		285.4
Long-term debt		1,637.4		1,562.4		—		1,562.4
Spire Alabama
As of June 30, 2023
Cash and cash equivalents	$	0.5	$	0.5	$	0.5	$	—
Notes payable – associated companies		108.1		108.1		—		108.1
Long-term debt		745.8		681.5		—		681.5
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 June 30, 2022
Cash and cash equivalents	$	3.7	$	3.7	$	3.7	$	—
Notes payable – associated companies		196.3		196.3		—		196.3
Long-term debt		571.4		527.2		—		527.2