Note 8 - Pension Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended December 31,
	2022			2021
Spire
Service cost – benefits earned during the period	$	4.1		$	5.4
Interest cost on projected benefit obligation		6.4			5.1
Expected return on plan assets		(6.4	)		(8.2	)
Amortization of prior service credit		(1.1	)		(1.1	)
Amortization of actuarial loss		1.6			3.7
Loss on lump-sum settlements		8.6			—
Subtotal		13.2			4.9
Regulatory adjustment		1.8			10.6
Net pension cost	$	15.0		$	15.5
Spire Missouri
Service cost – benefits earned during the period	$	2.8		$	3.9
Interest cost on projected benefit obligation		4.5			3.5
Expected return on plan assets		(4.5	)		(6.0	)
Amortization of prior service credit		(0.5	)		(0.5	)
Amortization of actuarial loss		1.5			2.8
Subtotal	3.8				3.7
Regulatory adjustment		8.1			8.5
Net pension cost	$	11.9		$	12.2
Spire Alabama
Service cost – benefits earned during the period	$	1.1		$	1.4
Interest cost on projected benefit obligation		1.3			1.1
Expected return on plan assets		(1.1	)		(1.4	)
Amortization of prior service credit		(0.6	)		(0.6	)
Amortization of actuarial loss		0.1			0.9
Loss on lump-sum settlements		8.6			—
Subtotal		9.4			1.4
Regulatory adjustment		(6.5	)		1.9
Net pension cost	$	2.9		$	3.3

	Three Months Ended December 31,
	2022			2021
Spire
Service cost – benefits earned during the period	$	1.2		$	1.9
Interest cost on accumulated postretirement benefit obligation		2.1			1.5
Expected return on plan assets		(3.9	)		(4.2	)
Amortization of prior service cost		0.1			0.3
Amortization of actuarial gain		(1.0	)		(0.6	)
Subtotal		(1.5	)		(1.1	)
Regulatory adjustment		0.1			3.2
Net postretirement benefit (income) cost	$	(1.4	)	$	2.1
Spire Missouri
Service cost – benefits earned during the period	$	1.0		$	1.6
Interest cost on accumulated postretirement benefit obligation		1.6			1.1
Expected return on plan assets		(2.6	)		(2.8	)
Amortization of prior service cost		0.2			0.2
Amortization of actuarial gain		(0.8	)		(0.5	)
Subtotal		(0.6	)		(0.4	)
Regulatory adjustment		0.6			3.6
Net postretirement benefit cost	$	—		$	3.2
Spire Alabama
Service cost – benefits earned during the period	$	0.2		$	0.3
Interest cost on accumulated postretirement benefit obligation		0.4			0.4
Expected return on plan assets		(1.2	)		(1.3	)
Amortization of prior service (credit) cost		(0.1	)		0.1
Amortization of actuarial gain		(0.1	)		—
Subtotal		(0.8	)		(0.5	)
Regulatory adjustment		(0.5	)		(0.5	)
Net postretirement benefit income	$	(1.3	)	$	(1.0	)