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Note 13 - Pension Plans and Other Postretirement Benefits (Tables)

12 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

		*Spire*												*Spire Missouri*												*Spire Alabama*
		*2023*				*2022*				*2021*				*2023*				*2022*				*2021*				*2023*				*2022*				*2021*
Service cost – benefits earned during the period		$	16.3			$	20.0			$	21.7			$	11.4			$	14.4			$	15.4			$	4.2			$	4.8			$	5.5
Interest cost on projected benefit obligation			25.1				21.5				20.7				17.8				14.7				14.2				4.8				4.7				4.6
Expected return on plan assets			(24.5	)			(31.3	)			(31.6	)			(18.0	)			(22.7	)			(22.5	)			(3.5	)			(5.2	)			(5.8	)
Amortization of prior service credit			(4.5	)			(4.5	)			(3.1	)			(1.9	)			(1.9	)			(0.6	)			(2.4	)			(2.4	)			(2.3	)
Amortization of actuarial loss			6.6				11.9				14.9				6.1				9.6				11.0				0.9				2.4				3.9
Loss on lump-sum settlements and curtailments			9.7				33.6				18.2				0.6				27.3				11.6				9.1				6.3				6.6
Subtotal			28.7				51.2				40.8				16.0				41.4				29.1				13.1				10.6				12.5
Regulatory adjustment			26.3				12.5				20.6				27.1				9.9				19.0				(1.7	)			1.7				0.7
Net pension cost		$	55.0			$	63.7			$	61.4			$	43.1			$	51.3			$	48.1			$	11.4			$	12.3			$	13.2

		*Spire*												*Spire Missouri*												*Spire Alabama*
		*2023*				*2022*				*2021*				*2023*				*2022*				*2021*				*2023*				*2022*				*2021*
Service cost – benefits earned during the period		$	4.8			$	7.5			$	7.3			$	4.0			$	6.3			$	6.2			$	0.7			$	1.1			$	0.9
Interest cost on accumulated postretirement benefit obligation			8.5				6.0				6.0				6.5				4.5				4.5				1.8				1.4				1.3
Expected return on plan assets			(15.8	)			(16.8	)			(16.1	)			(10.5	)			(11.3	)			(10.9	)			(5.0	)			(5.2	)			(4.9	)
Amortization of prior service cost (credit)			0.3				1.0				1.0				0.6				0.7				0.7				(0.3	)			0.3				0.3
Amortization of actuarial gain			(4.0	)			(2.2	)			(1.6	)			(3.2	)			(1.9	)			(1.5	)			(0.5	)			—				—
Subtotal			(6.2	)			(4.5	)			(3.4	)			(2.6	)			(1.7	)			(1.0	)			(3.3	)			(2.4	)			(2.4	)
Regulatory adjustment			0.6				3.3				13.2				1.8				5.0				15.0				(1.3	)			(1.8	)			(1.8	)
Net postretirement benefit (income) cost		$	(5.6	)		$	(1.2	)		$	9.8			$	(0.8	)		$	3.3			$	14.0			$	(4.6	)		$	(4.2	)		$	(4.2	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

		*Spire*												*Spire Missouri*												*Spire Alabama*
		*2023*				*2022*				*2021*				*2023*				*2022*				*2021*				*2023*				*2022*				*2021*
Current year actuarial loss (gain)		$	14.5			$	(16.9	)		$	(8.1	)		$	5.7			$	0.9			$	(0.9	)		$	9.0			$	(16.0	)		$	(1.5	)
Amortization of actuarial loss			(6.6	)			(11.9	)			(14.9	)			(6.1	)			(9.6	)			(11.0	)			(0.9	)			(2.4	)			(3.9	)
Acceleration of loss recognized due to settlement			(9.7	)			(33.6	)			(18.2	)			(0.6	)			(27.3	)			(11.6	)			(9.1	)			(6.3	)			(6.6	)
Current year service credit			—				—				(17.9	)			—				—				(17.9	)			—				—				—
Amortization of prior service credit			4.5				4.5				3.1				1.9				1.9				0.6				2.4				2.4				2.3
Subtotal			2.7				(57.9	)			(56.0	)			0.9				(34.1	)			(40.8	)			1.4				(22.3	)			(9.7	)
Regulatory adjustment			(2.8	)			56.3				57.3				(1.0	)			32.5				42.1				(1.4	)			22.3				9.7
Total recognized in OCI		$	(0.1	)		$	(1.6	)		$	1.3			$	(0.1	)		$	(1.6	)		$	1.3			$	—			$	—			$	—

		*Spire*												*Spire Missouri*												*Spire Alabama*
		*2023*				*2022*				*2021*				*2023*				*2022*				*2021*				*2023*				*2022*				*2021*
Current year actuarial (gain) loss		$	(24.4	)		$	15.8			$	(41.0	)		$	(21.5	)		$	9.8			$	(29.0	)		$	(1.1	)		$	5.9			$	(9.9	)
Amortization of actuarial gain			4.0				2.2				1.6				3.2				1.9				1.5				0.5				—				—
Current year prior service cost			—				(6.3	)			—								(1.1	)			—				—				(5.2	)			—
Amortization of prior service (cost) credit			(0.3	)			(1.0	)			(1.0	)			(0.6	)			(0.7	)			(0.7	)			0.3				(0.3	)			(0.3	)
Subtotal			(20.7	)			10.7				(40.4	)			(18.9	)			9.9				(28.2	)			(0.3	)			0.4				(10.2	)
Regulatory adjustment			20.7				(10.7	)			40.4				18.9				(9.9	)			28.2				0.3				(0.4	)			10.2
Total recognized in OCI		$	—			$	—			$	—			$	—			$	—			$	—			$	—			$	—			$	—

Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Benefit obligation, beginning of year		$	464.4			$	689.6			$	320.6			$	479.0			$	97.8			$	149.4
Service cost			16.3				20.0				11.4				14.4				4.2				4.8
Interest cost			25.1				21.5				17.8				14.7				4.8				4.7
Actuarial (gain) loss			(1.1	)			(173.9	)			(4.9	)			(116.2	)			5.4				(42.4	)
Settlement loss			9.7				33.4				0.6				27.9				9.1				5.6
Settlement benefits paid			(48.8	)			(109.3	)			(9.9	)			(87.0	)			(38.8	)			(22.3	)
Regular benefits paid			(26.9	)			(16.9	)			(22.4	)			(12.2	)			(1.9	)			(2.0	)
Benefit obligation, end of year		$	438.7			$	464.4			$	313.2			$	320.6			$	80.6			$	97.8
Accumulated benefit obligation, end of year		$	433.1			$	457.1			$	309.5			$	315.0			$	78.8			$	96.2

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Benefit obligation, beginning of year		$	148.1			$	204.2			$	114.8			$	151.7			$	29.9			$	48.0
Service cost			4.8				7.5				4.0				6.3				0.7				1.1
Interest cost			8.5				6.0				6.5				4.5				1.8				1.4
Actuarial (gain) loss			(10.6	)			(52.6	)			(13.4	)			(37.7	)			4.2				(13.6	)
Plan amendments			—				(6.2	)			—				(1.0	)			—				(5.2	)
Retiree drug subsidy program			0.2				0.2				0.2				0.2				—				—
Benefits paid			(8.4	)			(11.0	)			(6.8	)			(9.2	)			(1.5	)			(1.8	)
Benefit obligation, end of year		$	142.6			$	148.1			$	105.3			$	114.8			$	35.1			$	29.9

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Fair value of plan assets, beginning of year		$	332.7			$	498.9			$	235.9			$	364.0			$	57.3			$	82.8
Actual return on plan assets			9.1				(92.5	)			7.5				(66.7	)			—				(15.6	)
Employer contributions			58.9				52.4				30.3				37.8				27.9				14.4
Settlement benefits paid			(39.1	)			(109.3	)			(9.3	)			(87.0	)			(29.7	)			(22.3	)
Regular benefits paid			(26.9	)			(16.8	)			(22.4	)			(12.2	)			(1.9	)			(2.0	)
Fair value of plan assets, end of year		$	334.7			$	332.7			$	242.0			$	235.9			$	53.6			$	57.3
Funded status of plans, end of year		$	(104.0	)		$	(131.7	)		$	(71.2	)		$	(84.7	)		$	(27.0	)		$	(40.5	)

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Fair value of plan assets at beginning of year		$	264.7			$	326.9			$	176.7			$	221.7			$	83.3			$	99.4
Actual return on plan assets			29.9				(51.6	)			18.8				(36.2	)			10.2				(14.3	)
Employer contributions			0.1				0.4				0.1				0.4				—				—
Benefits paid			(8.4	)			(11.0	)			(6.8	)			(9.2	)			(1.5	)			(1.8	)
Fair value of plan assets, end of year		$	286.3			$	264.7			$	188.8			$	176.7			$	92.0			$	83.3
Funded status of plans, end of year		$	143.7			$	116.6			$	83.5			$	61.9			$	56.9			$	53.4

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Current liabilities		$	(1.6	)		$	(1.1	)		$	(1.6	)		$	(1.1	)		$	—			$	—
Noncurrent liabilities			(102.4	)			(130.6	)			(69.6	)			(83.6	)			(27.0	)			(40.5	)
Total		$	(104.0	)		$	(131.7	)		$	(71.2	)		$	(84.7	)		$	(27.0	)		$	(40.5	)

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Noncurrent assets		$	180.7			$	151.6			$	120.5			$	96.9			$	56.9			$	53.4
Current liabilities			(0.4	)			(0.3	)			(0.4	)			(0.3	)			—				—
Noncurrent liabilities			(36.6	)			(34.7	)			(36.6	)			(34.7	)			—				—
Total		$	143.7			$	116.6			$	83.5			$	61.9			$	56.9			$	53.4

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Net actuarial loss		$	130.1			$	132.0			$	92.5			$	93.6			$	40.2			$	41.2
Prior service credit			(31.2	)			(35.7	)			(16.2	)			(18.1	)			(13.9	)			(16.3	)
Subtotal			98.9				96.3				76.3				75.5				26.3				24.9
Adjustments for amounts included in regulatory assets			(95.9	)			(93.1	)			(73.3	)			(72.3	)			(26.3	)			(24.9	)
Total		$	3.0			$	3.2			$	3.0			$	3.2			$	—			$	—

		*Spire*								*Spire Missouri*								*Spire Alabama*
		*2023*				*2022*				*2023*				*2022*				*2023*				*2022*
Net actuarial gain		$	(103.3	)		$	(83.3	)		$	(92.3	)		$	(74.2	)		$	(6.1	)		$	(5.6	)
Prior service cost (credit)			7.0				7.1				7.4				7.9				(0.4	)			(0.8	)
Subtotal			(96.3	)			(76.2	)			(84.9	)			(66.3	)			(6.5	)			(6.4	)
Adjustments for amounts included in regulatory assets			96.3				76.2				84.9				66.3				6.5				6.4
Total		$	—			$	—			$	—			$	—			$	—			$	—

Defined Benefit Plan, Assumptions [Table Text Block]

		2023				2022				2021
Weighted average discount rate - Spire Missouri East plan			5.70%				3.00%				2.85%
Weighted average discount rate - Spire Missouri West plan			5.80%				3.00%				2.75%
Weighted average rate of future compensation increase			3.00%				3.00%				3.00%
Expected long-term rate of return on plan assets			6.50%				6.75%				6.75%

		2023				2022				2021
Weighted average discount rate		5.65%/5.7%				3.10%/3.0%				2.95%/2.80%
Weighted average rate of future compensation increase			3.00%				3.00%				3.00%
Expected long-term rate of return on plan assets			6.50%				6.75%				6.75%

		2023				2022
Weighted average discount rate - Spire Missouri East plan			6.25%				5.70%
Weighted average discount rate - Spire Missouri West plan			6.30%				5.80%
Weighted average discount rate - Spire Alabama plans		6.2%/6.25%				5.70%/5.65%
Weighted average rate of future compensation increase			3.00%				3.00%
Cash balance interest crediting rate - Spire Alabama / Spire Missouri			4.25%				4.25%

		2023				2022				2021
Weighted average discount rate - Spire Missouri plans			5.80%				2.95%				2.75%
Weighted average rate of future compensation increase			3.00%				3.00%				3.00%
Expected long-term rate of return on plan assets - Spire Missouri plans			5.50%				5.75%				5.75%

2023

2022

2021

Weighted average discount rate

5.80%

2.95%

2.75%

Expected long-term rate of return on plan assets

4.75%/6.0%

5.00%/6.25%

5.00%/6.25%

		2023				2022
Weighted average discount rate - Spire Alabama plans and Spire Missouri Plans			6.30%				5.80%
Weighted average rate of future compensation increase - Spire Missouri East plans			3.00%				3.00%

Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]

		Spire								Spire Missouri								Spire Alabama
		2023				2022				2023				2022				2023				2022
Projected benefit obligation		$	438.7			$	464.4			$	313.2			$	320.6			$	80.6			$	97.8
Accumulated benefit obligation			433.1				457.1				309.5				315.0				78.8				96.2
Fair value of plan assets			334.7				332.7				242.0				235.9				53.6				57.3

Schedule of Allocation of Plan Assets [Table Text Block]

Spire Missouri		*2023 Target*				*2023 Actual*				*2022 Target*				*2022 Actual*
Return seeking assets			70.0	%			77.0	%			70.0	%			74.3	%
Liability hedging assets			30.0	%			20.0	%			30.0	%			22.8	%
Cash and cash equivalents			—	%			3.0	%			—	%			2.9	%
Total			100.0	%			100.0	%			100.0	%			100.0	%

Spire Alabama		*2023 Target*				*2023 Actual*				*2022 Target*				*2022 Actual*
Return seeking assets			75.0	%			76.0	%			70.0	%			68.7	%
Liability hedging assets			25.0	%			15.0	%			30.0	%			25.3	%
Cash and cash equivalents			—	%			9.0	%			—	%			6.0	%
Total			100.0	%			100.0	%			100.0	%			100.0	%

Spire Missouri		*Target*				*2023 Actual*				*2022 Actual*
Equity securities			60.0	%			58.9	%			58.7	%
Debt securities			40.0	%			38.1	%			40.5	%
Cash and cash equivalents			—	%			3.0	%			0.8	%
Total			100.0	%			100.0	%			100.0	%

Spire Alabama		*Target*				*2023 Actual*				*2022 Actual*
Equity securities			60.5	%			59.9	%			57.7	%
Debt securities			39.5	%			40.1	%			42.3	%
Total			100.0	%			100.0	%			100.0	%

Schedule of Expected Benefit Payments [Table Text Block]

		2024				2025				2026				2027				2028				2029 – 2032
Spire		$	52.4			$	45.3			$	41.8			$	41.8			$	43.3			$	202.8
Spire Missouri			41.0				34.1				30.4				29.4				30.5				139.1
Spire Alabama			8.0				7.7				7.8				8.7				8.9				44.1

		2024				2025				2026				2027				2028				2029 – 2032
Spire		$	14.6			$	14.8			$	14.9			$	14.8			$	14.5			$	68.6
Spire Missouri			11.6				11.8				11.8				11.7				11.4				52.2
Spire Alabama			2.9				2.9				2.9				2.9				2.9				15.0

Schedule of Health Care Cost Trend Rates [Table Text Block]

		2023			2022
Medical cost trend assumed for next year - Spire Alabama and Spire Missouri		6.50%			6.75%
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		2030			2028

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		*As of September 30, 2023*												*As of September 30, 2022*
		*Quoted Prices*				*Significant*								*Quoted Prices*				*Significant*
		*in Active*				*Observable*								*in Active*				*Observable*
		*Markets*				*Inputs*								*Markets*				*Inputs*
		*(Level 1)*				*(Level 2)*				*Total*				*(Level 1)*				*(Level 2)*				*Total*
Cash and cash equivalents		$	14.8			$	—			$	14.8			$	11.5			$	—			$	11.5
Equity funds - global (including U.S.)			—				139.0				139.0				—				122.2				122.2
Real asset funds			—				55.2				55.2				—				61.0				61.0
Debt securities:
U.S. bond funds			27.8				—				27.8				42.3				—				42.3
U.S. government index funds			36.2				—				36.2				36.1				—				36.1
Global funds (including U.S.)			—				61.7				61.7				—				59.6				59.6
Total		$	78.8			$	255.9			$	334.7			$	89.9			$	242.8			$	332.7

		*As of September 30, 2023*												*As of September 30, 2022*
		*Quoted Prices*				*Significant*								*Quoted Prices*				*Significant*
		*in Active*				*Observable*								*in Active*				*Observable*
		*Markets*				*Inputs*								*Markets*				*Inputs*
		*(Level 1)*				*(Level 2)*				*Total*				*(Level 1)*				*(Level 2)*				*Total*
Cash and cash equivalents		$	5.1			$	—			$	5.1			$	3.5			$	—			$	3.5
U.S. stock/bond mutual funds			188.2				76.5				264.7				177.1				69.4				246.5
International fund			—				16.5				16.5				0.8				13.9				14.7
Total		$	193.3			$	93.0			$	286.3			$	181.4			$	83.3			$	264.7

		*As of September 30, 2023*												*As of September 30, 2022*
		*Quoted Prices*				*Significant*								*Quoted Prices*				*Significant*
		*in Active*				*Observable*								*in Active*				*Observable*
		*Markets*				*Inputs*								*Markets*				*Inputs*
		*(Level 1)*				*(Level 2)*				*Total*				*(Level 1)*				*(Level 2)*				*Total*
Cash and cash equivalents		$	6.8			$	—			$	6.8			$	5.7			$	—			$	5.7
Equity funds - global (including U.S.)			—				99.4				99.4				—				85.7				85.7
Real asset funds			—				40.2				40.2				—				47.2				47.2
Debt securities:
U.S. bond funds			20.9				—				20.9				29.4				—				29.4
U.S. government index funds			28.7				—				28.7				24.6				—				24.6
Global funds (including U.S.)			—				46.0				46.0				—				43.3				43.3
Total		$	56.4			$	185.6			$	242.0			$	59.7			$	176.2			$	235.9

		*As of September 30, 2023*												*As of September 30, 2022*
		*Quoted Prices*				*Significant*								*Quoted Prices*				*Significant*
		*in Active*				*Observable*								*in Active*				*Observable*
		*Markets*				*Inputs*								*Markets*				*Inputs*
		*(Level 1)*				*(Level 2)*				*Total*				*(Level 1)*				*(Level 2)*				*Total*
Cash and cash equivalents		$	4.3			$	—			$	4.3			$	2.7			$	—			$	2.7
U.S. stock/bond mutual funds			184.5				—				184.5				174.0				—				174.0
Total		$	188.8			$	—			$	188.8			$	176.7			$	—			$	176.7

		*As of September 30, 2023*												*As of September 30, 2022*
		*Quoted Prices*				*Significant*								*Quoted Prices*				*Significant*
		*in Active*				*Observable*								*in Active*				*Observable*
		*Markets*				*Inputs*								*Markets*				*Inputs*
		*(Level 1)*				*(Level 2)*				*Total*				*(Level 1)*				*(Level 2)*				*Total*
Cash and cash equivalents		$	4.6			$	—			$	4.6			$	3.5			$	—			$	3.5
Equity funds - global (including U.S.)			—				22.9				22.9				—				21.6				21.6
Real asset funds			—				8.7				8.7				—				8.1				8.1
Debt securities:
U.S. bond funds			4.0				—				4.0				7.7				—				7.7
U.S. government index funds			4.3				—				4.3				6.8				—				6.8
Global funds (including U.S.)			—				9.1				9.1				—				9.6				9.6
Total		$	12.9			$	40.7			$	53.6			$	18.0			$	39.3			$	57.3

		*As of September 30, 2023*												*As of September 30, 2022*
		*Quoted Prices*				*Significant*								*Quoted Prices*				*Significant*
		*in Active*				*Observable*								*in Active*				*Observable*
		*Markets*				*Inputs*								*Markets*				*Inputs*
		*(Level 1)*				*(Level 2)*				*Total*				*(Level 1)*				*(Level 2)*				*Total*
U.S. stock/bond mutual funds		$	—			$	76.5			$	76.5			$	—			$	69.4			$	69.4
International fund			—				15.5				15.5				—				13.9				13.9
Total		$	—			$	92.0			$	92.0			$	—			$	83.3			$	83.3