Pension Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Mar. 31, 2022

Pension Plans

Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]

Net periodic cost

The net periodic pension cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except for Spire Alabama’s losses on lump-sum settlements. Such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.”

	Three Months Ended March 31,						Six Months Ended March 31,
	2022			2021			2022			2021
Spire
Service cost – benefits earned during the period	$	5.4		$	5.3		$	10.8		$	10.9
Interest cost on projected benefit obligation		5.3			4.6			10.4			9.8
Expected return on plan assets		(8.2	)		(7.1	)		(16.4	)		(15.1	)
Amortization of prior service credit		(1.2	)		(0.7	)		(2.3	)		(1.5	)
Amortization of actuarial loss		3.6			3.8			7.3			7.8
Loss on lump-sum settlements		11.7			3.8			11.7			3.8
Subtotal		16.6			9.7			21.5			15.7
Regulatory adjustment		(1.2	)		5.2			9.4			14.8
Net pension cost	$	15.4		$	14.9		$	30.9		$	30.5
Spire Missouri
Service cost – benefits earned during the period	$	3.8		$	3.9		$	7.7		$	7.8
Interest cost on projected benefit obligation		3.6			3.5			7.1			7.0
Expected return on plan assets		(5.9	)		(5.6	)		(11.9	)		(11.2	)
Amortization of prior service credit		(0.5	)		(0.1	)		(1.0	)		(0.3	)
Amortization of actuarial loss		2.8			2.8			5.6			5.7
Loss on lump-sum settlements		6.8			—			6.8			—
Subtotal		10.6			4.5			14.3			9.0
Regulatory adjustment		1.1			7.5			9.6			15.1
Net pension cost	$	11.7		$	12.0		$	23.9		$	24.1
Spire Alabama
Service cost – benefits earned during the period	$	1.3		$	1.4		$	2.7		$	2.9
Interest cost on projected benefit obligation		1.2			1.2			2.3			2.4
Expected return on plan assets		(1.4	)		(1.5	)		(2.8	)		(3.1	)
Amortization of prior service credit		(0.6	)		(0.6	)		(1.2	)		(1.2	)
Amortization of actuarial loss		0.8			1.0			1.7			2.1
Loss on lump-sum settlements		4.9			3.8			4.9			3.8
Subtotal		6.2			5.3			7.6			6.9
Regulatory adjustment		(2.5	)		(2.5	)		(0.6	)		(0.7	)
Net pension cost	$	3.7		$	2.8		$	7.0		$	6.2

Other Postretirement Plans

Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]

Net periodic cost

The net periodic postretirement benefit cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except in the event Spire Alabama incurs losses on lump-sum settlements. Any such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.”

	Three Months Ended March 31,						Six Months Ended March 31,
	2022			2021			2022			2021
Spire
Service cost – benefits earned during the period	$	2.0		$	1.9		$	3.9		$	3.7
Interest cost on accumulated postretirement benefit obligation		1.5			1.6			3.0			3.0
Expected return on plan assets		(4.3	)		(4.1	)		(8.5	)		(8.1	)
Amortization of prior service cost		0.2			0.2			0.5			0.5
Amortization of actuarial gain		(0.6	)		(0.4	)		(1.2	)		(0.8	)
Subtotal		(1.2	)		(0.8	)		(2.3	)		(1.7	)
Regulatory adjustment		0.1			3.2			3.3			6.6
Net postretirement benefit (income) cost	$	(1.1	)	$	2.4		$	1.0		$	4.9
Spire Missouri
Service cost – benefits earned during the period	$	1.6		$	1.5		$	3.2		$	3.1
Interest cost on accumulated postretirement benefit obligation		1.1			1.1			2.2			2.2
Expected return on plan assets		(2.9	)		(2.8	)		(5.7	)		(5.5	)
Amortization of prior service cost		0.2			0.2			0.4			0.4
Amortization of actuarial gain		(0.5	)		(0.3	)		(1.0	)		(0.7	)
Subtotal		(0.5	)		(0.3	)		(0.9	)		(0.5	)
Regulatory adjustment		0.5			3.7			4.1			7.5
Net postretirement benefit cost	$	—		$	3.4		$	3.2		$	7.0
Spire Alabama
Service cost – benefits earned during the period	$	0.3		$	0.3		$	0.6		$	0.5
Interest cost on accumulated postretirement benefit obligation		0.3			0.4			0.7			0.7
Expected return on plan assets		(1.3	)		(1.3	)		(2.6	)		(2.5	)
Amortization of prior service cost		—			—			0.1			0.1
Subtotal		(0.7	)		(0.6	)		(1.2	)		(1.2	)
Regulatory adjustment		(0.4	)		(0.5	)		(0.9	)		(0.9	)
Net postretirement benefit income	$	(1.1	)	$	(1.1	)	$	(2.1	)	$	(2.1	)