Note 9 - Pension Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Jun. 30, 2023

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended June 30,						Nine Months Ended June 30,
	2023			2022			2023			2022
Spire
Service cost – benefits earned during the period	$	4.2		$	4.8		$	12.2		$	15.6
Interest cost on projected benefit obligation		6.6			5.4			18.9			15.8
Expected return on plan assets		(6.4	)		(7.7	)		(18.5	)		(24.1	)
Amortization of prior service credit		(1.1	)		(1.1	)		(3.4	)		(3.4	)
Amortization of actuarial loss		1.5			2.5			4.7			9.8
Loss on lump-sum settlements		—			17.8			8.6			29.5
Subtotal		4.8			21.7			22.5			43.2
Regulatory adjustment		6.1			(6.9	)		18.3			2.5
Net pension cost	$	10.9		$	14.8		$	40.8		$	45.7
Spire Missouri
Service cost – benefits earned during the period	$	2.8		$	3.5		$	8.5		$	11.2
Interest cost on projected benefit obligation		4.5			3.8			13.4			10.9
Expected return on plan assets		(4.5	)		(5.7	)		(13.5	)		(17.6	)
Amortization of prior service credit		(0.5	)		(0.5	)		(1.5	)		(1.5	)
Amortization of actuarial loss		1.5			2.0			4.6			7.6
Loss on lump-sum settlements		—			17.3			—			24.1
Subtotal		3.8			20.4			11.5			34.7
Regulatory adjustment		3.4			(8.3	)		19.6			1.3
Net pension cost	$	7.2		$	12.1		$	31.1		$	36.0
Spire Alabama
Service cost – benefits earned during the period	$	1.3		$	1.1		$	3.2		$	3.8
Interest cost on projected benefit obligation		1.5			1.1			3.6			3.4
Expected return on plan assets		(1.1	)		(1.2	)		(2.7	)		(4.0	)
Amortization of prior service credit		(0.6	)		(0.6	)		(1.8	)		(1.8	)
Amortization of actuarial loss		0.1			0.5			0.4			2.2
Loss on lump-sum settlements		—			0.5			8.6			5.4
Subtotal		1.2			1.4			11.3			9.0
Regulatory adjustment		2.4			1.1			(2.0	)		0.5
Net pension cost	$	3.6		$	2.5		$	9.3		$	9.5

	Three Months Ended June 30,						Nine Months Ended June 30,
	2023			2022			2023			2022
Spire
Service cost – benefits earned during the period	$	1.2		$	1.9		$	3.6		$	5.8
Interest cost on accumulated postretirement benefit obligation		2.0			1.6			6.3			4.6
Expected return on plan assets		(4.0	)		(4.3	)		(11.8	)		(12.8	)
Amortization of prior service cost		0.1			0.3			0.2			0.8
Amortization of actuarial gain		(0.9	)		(0.5	)		(3.0	)		(1.7	)
Subtotal		(1.6	)		(1.0	)		(4.7	)		(3.3	)
Regulatory adjustment		(0.5	)		(0.1	)		(0.2	)		3.2
Net postretirement benefit income	$	(2.1	)	$	(1.1	)	$	(4.9	)	$	(0.1	)
Spire Missouri
Service cost – benefits earned during the period	$	1.0		$	1.6		$	3.0		$	4.8
Interest cost on accumulated postretirement benefit obligation		1.6			1.2			4.9			3.4
Expected return on plan assets		(2.6	)		(2.9	)		(7.9	)		(8.6	)
Amortization of prior service cost		0.1			0.2			0.4			0.6
Amortization of actuarial gain		(0.8	)		(0.5	)		(2.4	)		(1.5	)
Subtotal		(0.7	)		(0.4	)		(2.0	)		(1.3	)
Regulatory adjustment		(0.2	)		0.4			1.1			4.5
Net postretirement benefit cost	$	(0.9	)	$	—		$	(0.9	)	$	3.2
Spire Alabama
Service cost – benefits earned during the period	$	0.2		$	0.3		$	0.5		$	0.9
Interest cost on accumulated postretirement benefit obligation		0.4			0.4			1.3			1.1
Expected return on plan assets		(1.3	)		(1.3	)		(3.8	)		(3.9	)
Amortization of prior service (credit) cost		—			0.1			(0.2	)		0.2
Amortization of actuarial gain		(0.1	)		—			(0.4	)		—
Subtotal		(0.8	)		(0.5	)		(2.6	)		(1.7	)
Regulatory adjustment		(0.5	)		(0.5	)		(1.4	)		(1.4	)
Net postretirement benefit income	$	(1.3	)	$	(1.0	)	$	(4.0	)	$	(3.1	)