Leases (Tables)

12 Months Ended

Sep. 30, 2021

Leases [Abstract]

Operating Lease Cost Cash Flow and Noncash Information

Operating lease cost, cash flow and noncash information are shown in the following table.

	Spire				Spire Missouri				Spire Alabama
	2021		2020		2021		2020		2021		2020
Operating lease cost, including amounts capitalized	$	7.2	$	8.7	$	0.4	$	0.5	$	2.1	$	3.5
Cash flow and noncash information about operating leases:
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities		7.2		8.5		0.4		0.5		2.1		3.3
Right-of-use assets obtained in exchange for lease liabilities		—		71.1		—		2.1		—		10.0

Summary of Balance Sheet and Weighted-Average Information about Operating Leases

The following table shows year-end balance sheet and weighted-average information about operating leases.

	Spire						Spire Missouri						Spire Alabama
	2021			2020			2021			2020			2021			2020
Right-of-use assets	$	60.4		$	65.1		$	1.4		$	1.7		$	4.8		$	6.7
Lease liabilities, current		6.5			6.5			0.3			0.3			1.9			1.9
Lease liabilities, noncurrent		53.7			58.4			1.0			1.4			2.7			4.7
Weighted-average remaining lease term	15.3 years			15.9 years			4.5 years			5.3 years			2.3 years			3.3 years
Weighted-average discount rate		4.2	%		4.2	%		2.5	%		2.5	%		2.2	%		2.2	%

Schedule of Maturity Analysis for Operating Lease Liabilities

Following is a maturity analysis by fiscal year for operating lease liabilities as of September 30, 2021.

	Spire			Spire Missouri			Spire Alabama
2022	$	6.6		$	0.3		$	1.9
2023		7.2			0.3			2.1
2024		5.8			0.3			0.7
2025		5.1			0.3			—
2026		5.0			0.2			—
Thereafter		53.4			—			—
Total undiscounted lease payments		83.1			1.4			4.7
Less present value discount		(22.9	)		(0.1	)		(0.1	)
Total current and noncurrent lease liabilities	$	60.2		$	1.3		$	4.6