Note 7 - Notes Payable and Credit Agreements (Tables)

12 Months Ended

Sep. 30, 2024

Notes Tables

Schedule of Short-Term Debt [Table Text Block]

	Spire			Spire						Spire
	(Parent Only)			Missouri						Alabama			Spire
	CP			Term			Spire			Spire			Consol-
	Program			Loan			Note			Note			idated
Year Ended September 30, 2024
Highest borrowings outstanding	$	1,135.0		$	200.0		$	643.6		$	132.5		$	1,275.0
Lowest borrowings outstanding		554.6			—			228.5			5.5			741.0
Weighted average borrowings		860.2			63.5			437.0			57.9			923.7
Weighted average interest rate		5.6	%		6.4	%		5.6	%		5.6	%		5.7	%
As of September 30, 2024
Borrowings outstanding	$	947.0		$	—		$	495.3		$	48.4		$	947.0
Weighted average interest rate		5.2	%		0.0	%		5.2	%		5.2	%		5.2	%
As of September 30, 2023
Borrowings outstanding	$	955.5		$	—		$	540.6		$	124.1		$	955.5
Weighted average interest rate		5.6	%		0.0	%		5.6	%		5.6	%		5.6	%