Pension Plans and Other Postretirement Benefits (Tables)

12 Months Ended

Sep. 30, 2019

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

Fair Value Measurements Of Plan Assets

The table below categorizes the fair value measurements of the Spire pension plan assets:

	Quoted Prices in Active Markets (Level 1)			Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2019
Cash and cash equivalents	$	42.5		$	—	$	—	$	42.5
Equity mutual funds - U.S.		40.5			17.0		—		57.5
Equity mutual funds - international		30.1			8.6		—		38.7
Debt securities:
U.S. bond mutual funds		34.8			73.9		—		108.7
U.S. government		52.9			9.5		—		62.4
U.S. corporate		143.7			—		—		143.7
U.S. municipal		4.0			—		—		4.0
International		44.1			7.5		—		51.6
Derivatives and margin receivable		0.2			—		—		0.2
103-12 Direct Filing Entities		—			12.5		—		12.5
Total	$	392.8		$	129.0	$	—	$	521.8
As of September 30, 2018
Cash and cash equivalents	$	50.6		$	—	$	—	$	50.6
Equity mutual funds - U.S.		42.7			21.2		—		63.9
Equity mutual funds - international		20.7			4.1		—		24.8
Debt securities:
U.S. bond mutual funds		35.8			64.9		—		100.7
U.S. government		31.7			5.6		—		37.3
U.S. corporate		152.1			—		—		152.1
U.S. municipal		3.6			3.0		—		6.6
International		43.9			7.0		—		50.9
Derivatives and margin (payable)		(0.8	)		—		—		(0.8	)
103-12 Direct Filing Entities		—			13.1		—		13.1
Total	$	380.3		$	118.9	$	—	$	499.2

The table below categorizes the fair value measurements of Spire’s postretirement plan assets:

	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2019
Cash and cash equivalents	$	5.3	$	—	$	—	$	5.3
U.S. stock/bond mutual funds		187.1		71.8		—		258.9
International fund		1.0		14.6		—		15.6
Total	$	193.4	$	86.4	$	—	$	279.8
As of September 30, 2018
Cash and cash equivalents	$	3.7	$	—	$	—	$	3.7
U.S. stock/bond mutual funds		190.2		74.5		—		264.7
International fund		—		15.1		—		15.1
Total	$	193.9	$	89.6	$	—	$	283.5

Spire Missouri

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

Fair Value Measurements Of Plan Assets

The table below categorizes the fair value measurements of Spire Missouri’s pension plan assets:

	Quoted Prices in Active Markets (Level 1)			Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2019
Cash and cash equivalents	$	41.2		$	—	$	—	$	41.2
Equity mutual funds - U.S.		—			9.1		—		9.1
Equity mutual funds - international		—			3.3		—		3.3
Debt securities:
U.S. bond mutual funds		—			73.9		—		73.9
U.S. government		52.9			6.8		—		59.7
U.S. corporate		143.7			—		—		143.7
U.S. municipal		4.0			—		—		4.0
International		44.1			—		—		44.1
Derivatives and margin (payable)		0.2			—		—		0.2
Total	$	286.1		$	93.1	$	—	$	379.2
As of September 30, 2018
Cash and cash equivalents	$	35.2		$	—	$	—	$	35.2
Equity mutual funds - U.S.		—			8.4		—		8.4
Equity mutual funds - international		—			4.1		—		4.1
Debt securities:
U.S. bond mutual funds		—			64.9		—		64.9
U.S. government		31.7			3.0		—		34.7
U.S. corporate		152.1			—		—		152.1
U.S. municipal		3.6			3.0		—		6.6
International		43.9			—		—		43.9
Derivatives and margin (payable)		(0.8	)		—		—		(0.8	)
Total	$	265.7		$	83.4	$	—	$	349.1

The table below categorizes the fair value measurements of Spire Missouri’s postretirement plan assets:

	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2019
Cash and cash equivalents	$	5.2	$	—	$	—	$	5.2
U.S. stock/bond mutual funds		183.7		—		—		183.7
Total	$	188.9	$	—	$	—	$	188.9
As of September 30, 2018
Cash and cash equivalents	$	3.5	$	—	$	—	$	3.5
U.S. stock/bond mutual funds		186.0		—		—		186.0
Total	$	189.5	$	—	$	—	$	189.5

Spire Alabama

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

Fair Value Measurements Of Plan Assets

The table below categorizes the fair value measurements of Spire Alabama’s pension plan assets:

	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2019
Cash and cash equivalents	$	0.8	$	—	$	—	$	0.8
Equity mutual funds - U.S.		26.5		5.2		—		31.7
Equity mutual funds - international		19.7		3.5		—		23.2
Debt securities:
U.S. bond mutual funds		22.8		—		—		22.8
U.S. government		—		1.7		—		1.7
International		—		4.9		—		4.9
103-12 Direct Filing Entities		—		8.2		—		8.2
Total	$	69.8	$	23.5	$	—	$	93.3
As of September 30, 2018
Cash and cash equivalents	$	10.4	$	—	$	—	$	10.4
Equity mutual funds - U.S.		28.8		8.6		—		37.4
Equity mutual funds - international		14.0		—		—		14.0
Debt securities:
U.S. bond mutual funds		24.2		—		—		24.2
U.S. government		—		1.8		—		1.8
International		—		4.7		—		4.7
103-12 Direct Filing Entities		—		8.8		—		8.8
Total	$	77.4	$	23.9	$	—	$	101.3

The table below categorizes the fair value measurements of Spire Alabama’s postretirement plan assets:

	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2019
U.S. stock/bond mutual funds	$	—	$	71.8	$	—	$	71.8
International fund		—		14.6		—		14.6
Total	$	—	$	86.4	$	—	$	86.4
As of September 30, 2018
U.S. stock/bond mutual funds	$	—	$	74.5	$	—	$	74.5
International fund		—		15.1		—		15.1
Total	$	—	$	89.6	$	—	$	89.6

Pension Plans

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

Net Periodic Cost

The net periodic pension costs include the following components:

	Spire									Spire Missouri									Spire Alabama
	2019			2018			2017			2019			2018			2017			2019			2018			2017
Service cost – benefits earned during the period	$	19.3		$	20.2		$	20.5		$	12.4		$	12.7		$	12.7		$	6.2		$	6.4		$	6.2
Interest cost on projected benefit obligation		28.2			27.4			27.9			19.8			19.5			19.5			6.0			5.5			6.1
Expected return on plan assets		(36.3	)		(37.0	)		(38.5	)		(25.5	)		(27.2	)		(28.1	)		(7.3	)		(6.5	)		(7.2	)
Amortization of prior service (credit) cost		(1.1	)		(0.9	)		1.0			0.9			0.9			1.0			(1.8	)		(1.8	)		—
Amortization of actuarial loss		9.3			10.9			12.5			8.7			9.4			10.7			0.8			1.5			1.8
Loss on lump-sum settlements and curtailments		—			18.6			17.9			—			16.1			13.5			—			2.4			4.6
Special termination benefits		—			—			0.9			—			—			—			—			—			—
Subtotal		19.4			39.2			42.2			16.3			31.4			29.3			3.9			7.5			11.5
Regulatory adjustment		39.6			37.4			(2.4	)		31.8			32.1			(4.1	)		6.9			4.5			1.8
Net pension cost	$	59.0		$	76.6		$	39.8		$	48.1		$	63.5		$	25.2		$	10.8		$	12.0		$	13.3

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income

Other changes in plan assets and pension benefit obligations recognized in other comprehensive income or loss include the following:

	Spire									Spire Missouri									Spire Alabama
	2019			2018			2017			2019			2018			2017			2019			2018			2017
Current year actuarial loss (gain)	$	90.9		$	(1.4	)	$	14.1		$	59.0		$	2.2		$	14.8		$	26.3		$	(0.6	)	$	3.3
Amortization of actuarial loss		(9.3	)		(10.9	)		(12.5	)		(8.7	)		(9.4	)		(10.7	)		(0.8	)		(1.5	)		(1.8	)
Acceleration of loss recognized due to settlement		—			(18.5	)		(18.2	)		—			(16.1	)		(13.5	)		—			(2.4	)		(4.5	)
Current year service credit		(10.2	)		(0.1	)		—			(3.7	)		—			—			(6.5	)		—			—
Current year prior year service cost		—			—			(20.7	)		—			—			—			—			—			(20.7	)
Transfer due to merger		—			0.1			—			—			0.1			—			—			—			—
Amortization of prior service credit (cost)		1.1			(2.9	)		(1.0	)		(0.9	)		(0.9	)		(1.0	)		1.8			—			—
Amortization of transition asset		—			1.8			—			—			—			—			—			1.8			—
Subtotal		72.5			(31.9	)		(38.3	)		45.7			(24.1	)		(10.4	)		20.8			(2.7	)		(23.7	)
Regulatory adjustment		(71.7	)		31.6			38.0			(44.9	)		23.8			10.1			(20.8	)		2.7			23.7
Total recognized in OCI	$	0.8		$	(0.3	)	$	(0.3	)	$	0.8		$	(0.3	)	$	(0.3	)	$	—		$	—		$	—

Reconciliation of the Beginning and Ending Balances of Benefit Obligation

The following table shows the reconciliation of the beginning and ending balances of the pension benefit obligation at September 30:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019			2018
Benefit obligation, beginning of year	$	664.6		$	748.8		$	473.3		$	539.6		$	136.3		$	148.2
Service cost		19.3			20.2			12.4			12.7			6.2			6.4
Interest cost		28.2			27.4			19.8			19.5			6.0			5.5
Actuarial loss (gain)		104.8			(34.9	)		76.0			(26.0	)		23.7			(3.8	)
Plan amendments		(10.2	)		(2.0	)		(3.7	)		—			(6.5	)		—
Plan mergers		—			—			—			(0.3	)		—			—
Settlement loss		—			7.6			—			7.6			—			—
Settlement benefits paid		—			(82.8	)		—			(65.5	)		—			(17.3	)
Regular benefits paid		(55.3	)		(19.7	)		(39.4	)		(14.3	)		(13.2	)		(2.7	)
Benefit obligation, end of year	$	751.4		$	664.6		$	538.4		$	473.3		$	152.5		$	136.3
Accumulated benefit obligation, end of year	$	712.9		$	636.0		$	500.2		$	446.5		$	152.3		$	134.5

Fair Value of Plan Assets

The following table sets forth the reconciliation of the beginning and ending balances of the fair value of plan assets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019			2018
Fair value of plan assets, beginning of year	$	499.2		$	531.6		$	349.1		$	385.9		$	101.3		$	97.9
Actual return on plan assets		50.1			11.2			42.4			6.4			4.7			3.3
Employer contributions		27.8			58.9			27.1			36.9			0.5			20.1
Divestitures		—			—			—			(0.3	)		—			—
Settlement benefits paid		—			(82.8	)		—			(65.5	)		—			(17.3	)
Regular benefits paid		(55.3	)		(19.7	)		(39.4	)		(14.3	)		(13.2	)		(2.7	)
Fair value of plan assets, end of year	$	521.8		$	499.2		$	379.2		$	349.1		$	93.3		$	101.3
Funded status of plans, end of year	$	(229.6	)	$	(165.4	)	$	(159.2	)	$	(124.2	)	$	(59.2	)	$	(35.0	)

Amounts Recognized in Consolidated Balance Sheets

The following table sets forth the amounts recognized in the balance sheets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019			2018
Current liabilities	$	(0.5	)	$	(0.6	)	$	(0.5	)	$	(0.6	)	$	—		$	—
Noncurrent liabilities		(229.1	)		(164.8	)		(158.7	)		(123.6	)		(59.2	)		(35.0	)
Total	$	(229.6	)	$	(165.4	)	$	(159.2	)	$	(124.2	)	$	(59.2	)	$	(35.0	)

Pre-tax amounts recognized in accumulated other comprehensive loss not yet recognized as components of net periodic pension cost consist of:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019			2018
Net actuarial loss	$	213.7		$	132.1		$	153.1		$	102.8		$	61.9		$	36.4
Prior service (credit) cost		(23.7	)		(14.4	)		1.7			6.4			(23.5	)		(18.8	)
Subtotal		190.0			117.7			154.8			109.2			38.4			17.6
Adjustments for amounts included in regulatory assets		(187.1	)		(115.5	)		(151.9	)		(107.0	)		(38.4	)		(17.6	)
Total	$	2.9		$	2.2		$	2.9		$	2.2		$	—		$	—

Pre-tax Amounts Expected to Amortized From Accumulated Other Comprehensive Loss Into Net Periodic Pension Cost

At September 30, 2019, the following pre-tax amounts are expected to be amortized from accumulated other comprehensive loss into net periodic pension cost during fiscal 2020:

	Spire			Spire Missouri			Spire Alabama
Amortization of net actuarial loss	$	14.7		$	11.6		$	3.1
Amortization of prior service (credit) cost		(2.5	)		0.1			(2.4	)
Subtotal		12.2			11.7			0.7
Regulatory adjustment		(12.0	)		(11.5	)		(0.7	)
Total	$	0.2		$	0.2		$	—

Assumptions Used to Calculate Net Periodic Cost and Benefit Obligations

The assumptions used to calculate net periodic pension costs for Spire Missouri are as follows:

	2019	2018	2017
Weighted average discount rate - Spire Missouri East plan	4.30%	3.75%	3.50%
Weighted average discount rate - Spire Missouri West plan	4.35%	3.70%	3.50%
Weighted average rate of future compensation increase	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets	7.50%	7.75%	7.75%

The assumptions used to calculate net periodic pension costs for Spire Alabama are as follows:

	2019	2018	2017
Weighted average discount rate	4.35%	3.65%/3.70%	3.45%/3.50%
Weighted average rate of future compensation increase	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets	7.25%	7.25%	7.25%

The assumptions used to calculate the benefit obligations are as follows:

	2019	2018
Weighted average discount rate - Spire Missouri East plan	3.20%	4.30%
Weighted average discount rate - Spire Missouri West plan	3.15%	4.35%
Weighted average discount rate - Spire Alabama plans	3.20%/3.25%	4.35%
Weighted average rate of future compensation increase	3.00%	3.00%

Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Plans That Have Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets

Following are the year-end projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for plans that have a projected benefit obligation and an accumulated benefit obligation in excess of plan assets:

	Spire				Spire Missouri				Spire Alabama
	2019		2018		2019		2018		2019		2018
Projected benefit obligation	$	751.4	$	664.6	$	538.4	$	473.3	$	152.5	$	136.3
Accumulated benefit obligation		712.9		636.0		500.2		446.5		152.3		134.5
Fair value of plan assets		521.8		499.2		379.2		349.1		93.3		101.3

Targeted and Actual Plan Assets by Category

Following are the targeted and actual plan assets by category as of September 30 of each year for Spire Missouri and Spire Alabama:

Spire Missouri	2019 Target			2019 Actual			2018 Target			2018 Actual
Equity markets		56.5	%		57.0	%		56.4	%		55.3	%
Debt securities		43.5	%		39.8	%		43.6	%		42.4	%
Cash equivalents		—	%		3.2	%		—	%		2.3	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

Spire Alabama	2019 Target			2019 Actual			2018 Target			2018 Actual
Equity markets		60.0	%		58.5	%		60.0	%		59.4	%
Debt securities		29.0	%		29.8	%		29.0	%		28.6	%
Other*		11.0	%		11.7	%		11.0	%		12.0	%
Total		100.0	%		100.0	%		100.0	%		100.0	%

Expected Benefit Payments for Succeeding Five Fiscal Years

Following are expected pension benefit payments for the succeeding five fiscal years, and in aggregate for the five fiscal years thereafter, for Spire, Spire Missouri, and Spire Alabama:

	2020		2021		2022		2023		2024		2025- 2029
Spire	$	72.6	$	64.3	$	58.8	$	58.7	$	57.5	$	268.3
Spire Missouri		56.1		47.8		42.6		42.7		41.3		190.1
Spire Alabama		13.6		13.5		13.2		12.8		13.0		60.6

Other Postretirement Plans

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

Net Periodic Cost

Net periodic postretirement benefit costs consist of the following components:

	Spire									Spire Missouri									Spire Alabama
	2019			2018			2017			2019			2018			2017			2019			2018			2017
Service cost – benefits earned during the period	$	7.4		$	9.4		$	11.0		$	6.8		$	9.0		$	10.4		$	0.4		$	0.2		$	0.3
Interest cost on accumulated postretirement   benefit obligation		9.0			8.6			8.6			6.9			6.9			6.8			1.8			1.5			1.6
Expected return on plan assets		(16.2	)		(13.9	)		(13.6	)		(11.1	)		(9.6	)		(9.0	)		(4.8	)		(4.1	)		(4.4	)
Amortization of prior service (credit) cost		(0.1	)		(0.1	)		—			0.3			0.3			0.2			(0.4	)		(0.4	)		(0.2	)
Amortization of actuarial (gain) loss		(0.5	)		0.8			2.5			(0.5	)		0.9			2.6			—			(0.1	)		(0.1	)
Subtotal		(0.4	)		4.8			8.5			2.4			7.5			11.0			(3.0	)		(2.9	)		(2.8	)
Regulatory adjustment		10.0			2.2			(3.2	)		11.7			3.9			(1.5	)		(1.8	)		(1.8	)		(1.8	)
Net postretirement benefit cost	$	9.6		$	7.0		$	5.3		$	14.1		$	11.4		$	9.5		$	(4.8	)	$	(4.7	)	$	(4.6	)

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income

Other changes in plan assets and postretirement benefit obligations recognized in OCI include the following:

	Spire									Spire Missouri									Spire Alabama
	2019			2018			2017			2019			2018			2017			2019			2018			2017
Current year actuarial (gain) loss	$	(12.2	)	$	(45.1	)	$	(34.1	)	$	(17.3	)	$	(47.1	)	$	(28.5	)	$	5.5		$	1.6		$	(4.5	)
Amortization of actuarial gain (loss)		0.5			(0.8	)		(2.5	)		0.5			(0.9	)		(2.6	)		—			0.1			0.1
Current year prior service credit (cost)		5.5			—			(1.4	)		4.9			—			—			0.6			—			(1.4	)
Amortization of current year service cost		0.4			—			—			—			—			—			0.4			—			—
Amortization of prior service (cost) credit		(0.3	)		0.1			—			(0.3	)		(0.3	)		(0.2	)		—			0.4			0.2
Subtotal		(6.1	)		(45.8	)		(38.0	)		(12.2	)		(48.3	)		(31.3	)		6.5			2.1			(5.6	)
Regulatory adjustment		6.1			45.8			38.0			12.2			48.3			31.3			(6.5	)		(2.1	)		5.6
Total recognized in OCI	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—

Reconciliation of the Beginning and Ending Balances of Benefit Obligation

The following table sets forth the reconciliation of the beginning and ending balances of the postretirement benefit obligation at September 30:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019			2018
Benefit obligation, beginning of year	$	208.1		$	238.5		$	158.8		$	192.5		$	43.1		$	40.6
Service cost		7.4			9.4			6.8			9.0			0.4			0.2
Interest cost		9.0			8.6			6.9			6.9			1.8			1.5
Actuarial (gain) loss		(18.9	)		(37.5	)		(19.5	)		(41.1	)		1.2			3.1
Plan amendments		5.5			—			4.9			—			0.6			—
Retiree drug subsidy program		0.2			0.2			0.2			0.1			—			0.1
Benefits paid		(14.0	)		(11.1	)		(10.2	)		(8.6	)		(3.7	)		(2.4	)
Benefit obligation, end of year	$	197.3		$	208.1		$	147.9		$	158.8		$	43.4		$	43.1

Fair Value of Plan Assets

The following table sets forth the reconciliation of the beginning and ending balances of the fair value of plan assets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019			2018
Fair value of plan assets at beginning of year	$	283.5		$	265.5		$	189.5		$	174.9		$	89.6		$	86.4
Actual return on plan assets		9.7			21.5			9.0			15.6			0.5			5.6
Employer contributions		0.6			7.6			0.6			7.6			—			—
Benefits paid		(14.0	)		(11.1	)		(10.2	)		(8.6	)		(3.7	)		(2.4	)
Fair value of plan assets, end of year	$	279.8		$	283.5		$	188.9		$	189.5		$	86.4		$	89.6
Funded status of plans, end of year	$	82.5		$	75.4		$	41.0		$	30.7		$	43.0		$	46.5

Amounts Recognized in Consolidated Balance Sheets

The following table sets forth the amounts recognized in the balance sheets at September 30:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019		2018
Noncurrent assets	$	118.3		$	92.0		$	75.3		$	45.5		$	43.0	$	46.5
Current liabilities		(0.5	)		(0.5	)		(0.5	)		(0.5	)		—		—
Noncurrent liabilities		(35.3	)		(16.1	)		(33.8	)		(14.3	)		—		—
Total	$	82.5		$	75.4		$	41.0		$	30.7		$	43.0	$	46.5

Pre-tax amounts recognized in accumulated other comprehensive loss not yet recognized as components of net periodic postretirement benefit cost consist of:

	Spire						Spire Missouri						Spire Alabama
	2019			2018			2019			2018			2019			2018
Net actuarial gain	$	(56.3	)	$	(44.4	)	$	(52.6	)	$	(35.7	)	$	(2.6	)	$	(8.0	)
Prior service (credit) cost		(1.0	)		(6.6	)		0.6			(4.0	)		(1.6	)		(2.6	)
Subtotal		(57.3	)		(51.0	)		(52.0	)		(39.7	)		(4.2	)		(10.6	)
Adjustments for amounts included in regulatory assets		57.3			51.0			52.0			39.7			4.2			10.6
Total	$	—		$	—		$	—		$	—		$	—		$	—

Pre-tax Amounts Expected to Amortized From Accumulated Other Comprehensive Loss Into Net Periodic Pension Cost

At September 30, 2019, the following pre-tax amounts are expected to be amortized from accumulated other comprehensive loss into net periodic postretirement benefit cost during fiscal 2020:

	Spire			Spire Missouri			Spire Alabama
Amortization of net actuarial gain	$	(2.0	)	$	(2.0	)	$	—
Amortization of prior service credit		(0.5	)		(0.2	)		(0.3	)
Subtotal		(2.5	)		(2.2	)		(0.3	)
Regulatory adjustment		2.5			2.2			0.3
Total	$	—		$	—		$	—

Assumptions Used to Calculate Net Periodic Cost and Benefit Obligations

The assumptions used to calculate net periodic postretirement benefit costs for Spire Missouri are as follows:

	2019	2018	2017
Weighted average discount rate - Spire Missouri East plans	4.30%	3.60%	3.15%
Weighted average discount rate - Spire Missouri West plans	4.30%	3.60%	3.45%
Weighted average rate of future compensation increase	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets - Spire Missouri East plans	6.25%	5.75%/7.75%	5.75%/7.75%
Expected long-term rate of return on plan assets - Spire Missouri West plans	6.25%	5.75%	5.50%

The assumptions used to calculate net periodic postretirement benefit costs for Spire Alabama are as follows:

	2019	2018	2017
Weighted average discount rate	4.30%	3.80%	3.60%
Expected long-term rate of return on plan assets	5.00%/6.25%	3.75%/6.00%	4.00%/6.25%

The assumptions used to calculate the accumulated postretirement benefit obligations are as follows:

	2019	2018
Weighted average discount rate - Spire Alabama plans	3.15%	4.30%
Weighted average discount rate - Spire Missouri East plans	3.15%	4.30%
Weighted average discount rate - Spire Missouri West plans	3.15%	4.30%
Weighted average rate of future compensation increase - Spire Missouri East plans	3.00%	3.00%

Targeted and Actual Plan Assets by Category

Following are the targeted and actual plan assets by category as of September 30 of each year for Spire Missouri and Spire Alabama:

Spire Missouri	Target			2019 Actual			2018 Actual
Equity securities		60.0	%		58.4	%		58.8	%
Debt securities		40.0	%		38.8	%		39.1	%
Other (cash and cash equivalents held to make benefit payments)		—	%		2.8	%		2.1	%
Total		100.0	%		100.0	%		100.0	%

Spire Alabama	Target			2019 Actual			2018 Actual
Equity securities		60.0	%		60.3	%		60.0	%
Debt securities		40.0	%		39.7	%		40.0	%
Total		100.0	%		100.0	%		100.0	%

Expected Benefit Payments for Succeeding Five Fiscal Years

Following are expected postretirement benefit payments for the succeeding five fiscal years, and in aggregate for the five fiscal years thereafter for Spire, Spire Missouri, and Spire Alabama:

	2020		2021		2022		2023		2024		2025- 2029
Spire	$	13.6	$	14.0	$	14.5	$	14.8	$	15.0	$	73.0
Spire Missouri		10.6		11.0		11.4		11.7		11.8		57.1
Spire Alabama		2.7		2.7		2.8		2.8		2.8		13.5

Assumed Medical Cost Trend Rates and Effect of An Assumed 1% Changed in Assumed Medical Cost Trend.

The assumed medical cost trend rates at September 30 are as follows:

	2019	2018
Medical cost trend assumed for next year - Spire Missouri	6.75%	7.00%
Medical cost trend assumed for next year - Spire Alabama	6.75%	7.00%
Rate to which the medical cost trend rate is assumed to decline    (the ultimate medical cost trend rate)	5.00%	5.00%
Year the rate reaches the ultimate trend	2025	2025

The following table presents the effects of an assumed 1% change in the assumed medical cost trend rate:

	Spire					Spire Missouri					Spire Alabama
	1% Increase		1% Decrease			1% Increase		1% Decrease			1% Increase		1% Decrease
Net periodic postretirement benefit cost	$	1.1	$	(1.0	)	$	0.9	$	(0.8	)	$	0.1	$	(0.1	)
Accumulated postretirement benefit obligation		7.2		(6.5	)		4.7		(4.4	)		1.8		(1.6	)