Note 6 - Financing (Tables)

9 Months Ended

Jun. 30, 2023

Notes Tables

Schedule of Short-Term Debt [Table Text Block]

	Spire (Parent Only)			Spire Missouri						Spire Alabama			Spire
	CP			Term			Spire			Spire			Consol-
	Program			Loan			Note			Note			idated
Nine Months Ended June 30, 2023
Highest borrowings outstanding	$	1,282.0		$	250.0		$	656.9		$	274.0		$	1,482.0
Lowest borrowings outstanding		354.4			—			3.8			76.7			489.0
Weighted average borrowings		778.7			89.4			308.9			123.3			868.1
Weighted average interest rate		4.7	%		5.5	%		4.6	%		4.8	%		4.8	%
As of June 30, 2023
Borrowings outstanding	$	557.6		$	—		$	228.1		$	108.1		$	557.6
Weighted average interest rate		5.5	%		—	%		5.5	%		5.5	%		5.5	%
As of September 30, 2022
Borrowings outstanding	$	1,037.5		$	—		$	445.3		$	260.9		$	1,037.5
Weighted average interest rate		3.3	%		n/a			3.3	%		3.3	%		3.3	%
As of June 30, 2022
Borrowings outstanding	$	709.2		$	—		$	285.4		$	196.3		$	709.2
Weighted average interest rate		2.0	%		n/a			2.0	%		2.0	%		2.0	%

Summary Of Capitalized Interest [Table Text Block]

	Three Months Ended June 30,				Nine Months Ended June 30,
	2023		2022		2023		2022
Spire	$	2.3	$	1.1	$	5.8	$	3.2
Spire Missouri		1.0		0.2		2.1		0.3
Spire Alabama		0.5		0.9		1.8		2.5