Leases (Tables)

12 Months Ended

Sep. 30, 2020

Leases [Abstract]

Operating Lease Cost Cash Flow and Noncash Information

Operating lease cost, cash flow and noncash information for the year ended September 30, 2020, are shown in the following table.

	Spire		Spire Missouri		Spire Alabama
Operating lease cost, including amounts capitalized	$	8.7	$	0.5	$	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		8.5		0.5		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 balance sheet and weighted-average information about operating leases as of September 30, 2020.

	Balance sheet classification	Spire			Spire Missouri			Spire Alabama
Right-of-use assets	Deferred Charges and Other Assets: Other	$	65.1		$	1.7		$	6.7
Lease liabilities, current	Current Liabilities, Other		6.5			0.3			1.9
Lease liabilities, noncurrent	Deferred Credits and Other Liabilities: Other		58.4			1.4			4.7
Weighted-average remaining lease term		15.9 years			5.3 years			3.3 years
Weighted-average discount rate			4.2	%		2.5	%		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, 2020.

	Spire			Spire Missouri			Spire Alabama
2021	$	6.6		$	0.3		$	1.9
2022		7.2			0.4			2.1
2023		7.2			0.3			2.1
2024		5.8			0.3			0.7
2025		5.1			0.3			—
Thereafter		58.4			0.2			—
Total undiscounted lease payments		90.3			1.8			6.8
Less present value discount		(25.4	)		(0.1	)		(0.2	)
Total current and noncurrent lease liabilities	$	64.9		$	1.7		$	6.6

Schedule of Annual Minimum Rental Commitments for Operating Leases

The aggregate rental expense for fiscal years 2018 and 2019 and the annual minimum rental commitments for all leases having an initial or remaining non-cancelable term of more than one year as of September 30, 2019, were as follows (under ASC 840).

	Aggregate
	Rental Expense				Minimum Rental Commitments as of September 30, 2019
	2018		2019		2020		2021		2022		2023		2024		Later		Total
Spire	$	10.0	$	10.9	$	8.2	$	7.0	$	6.8	$	6.1	$	4.8	$	36.5	$	69.4
Spire Missouri		3.6		3.7		0.5		0.2		—		—		—		—		0.7
Spire Alabama		4.7		5.2		2.9		2.1		2.1		2.1		0.7		—		9.9