Note 7 - Notes Payable and Credit Agreements (Tables)

12 Months Ended

Sep. 30, 2022

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, 2022
Highest borrowings outstanding	$	1,079.0		$	250.0		$	456.6		$	265.2		$	1,079.0
Lowest borrowings outstanding		408.0			—			43.2			38.4			462.5
Weighted average borrowings		636.2			113.0			244.9			152.6			749.2
Weighted average interest rate		1.2	%		0.8	%		0.4	%		0.5	%		1.1	%
As of September 30, 2022
Borrowings outstanding	$	1,037.5		$	—		$	445.3		$	260.9		$	1,037.5
Weighted average interest rate		3.3	%		0.0	%		3.3	%		3.3	%		3.3	%
As of September 30, 2021
Borrowings outstanding	$	422.0		$	250.0		$	240.9		$	49.0		$	672.0
Weighted average interest rate		0.2	%		0.7	%		0.2	%		0.2	%		0.4	%