Notes Tables

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

	*Spire*									*Spire Missouri*									*Spire Alabama*
	*2022*			*2021*			*2020*			*2022*			*2021*			*2020*			*2022*			*2021*			*2020*
Current year actuarial (gain) loss	$	(16.9	)	$	(8.1	)	$	68.0		$	0.9		$	(0.9	)	$	37.8		$	(16.0	)	$	(1.5	)	$	24.4
Amortization of actuarial loss		(11.9	)		(14.9	)		(14.4	)		(9.6	)		(11.0	)		(11.3	)		(2.4	)		(3.9	)		(3.1	)
Acceleration of loss recognized due to settlement		(33.6	)		(18.2	)		(31.7	)		(27.3	)		(11.6	)		(26.6	)		(6.3	)		(6.6	)		(5.1	)
Current year service credit		—			(17.9	)		(4.4	)		—			(17.9	)		(4.4	)		—			—			—
Amortization of prior service credit (cost)		4.5			3.1			2.5			1.9			0.6			(0.1	)		2.4			2.3			2.4
Subtotal		(57.9	)		(56.0	)		20.0			(34.1	)		(40.8	)		(4.6	)		(22.3	)		(9.7	)		18.6
Regulatory adjustment		56.3			57.3			(19.5	)		32.5			42.1			5.1			22.3			9.7			(18.6	)
Total recognized in OCI	$	(1.6	)	$	1.3		$	0.5		$	(1.6	)	$	1.3		$	0.5		$	—		$	—		$	—

	*Spire*									*Spire Missouri*									*Spire Alabama*
	*2022*			*2021*			*2020*			*2022*			*2021*			*2020*			*2022*			*2021*			*2020*
Current year actuarial loss (gain)	$	15.8		$	(41.0	)	$	(7.3	)	$	9.8		$	(29.0	)	$	(7.6	)	$	5.9		$	(9.9	)	$	1.1
Amortization of actuarial gain		2.2			1.6			2.0			1.9			1.5			2.0			—			—			—
Current year prior service (cost) credit		(6.3	)		—			15.8			(1.1	)		—			9.5			(5.2	)		—			6.3
Amortization of prior service (cost) credit		(1.0	)		(1.0	)		0.5			(0.7	)		(0.7	)		0.2			(0.3	)		(0.3	)		0.3
Subtotal		10.7			(40.4	)		11.0			9.9			(28.2	)		4.1			0.4			(10.2	)		7.7
Regulatory adjustment		(10.7	)		40.4			(11.0	)		(9.9	)		28.2			(4.1	)		(0.4	)		10.2			(7.7	)
Total recognized in OCI	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—

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

	*Spire*						*Spire Missouri*						*Spire Alabama*
	*2022*			*2021*			*2022*			*2021*			*2022*			*2021*
Fair value of plan assets, beginning of year	$	498.9		$	473.1		$	364.0		$	336.2		$	82.8		$	88.6
Actual return on plan assets		(92.5	)		58.8			(66.7	)		42.7			(15.6	)		9.6
Employer contributions		52.4			53.4			37.8			42.2			14.4			11.1
Settlement benefits paid		(109.3	)		(67.6	)		(87.0	)		(44.6	)		(22.3	)		(22.9	)
Regular benefits paid		(16.8	)		(18.8	)		(12.2	)		(12.5	)		(2.0	)		(3.6	)
Fair value of plan assets, end of year	$	332.7		$	498.9		$	235.9		$	364.0		$	57.3		$	82.8
Funded status of plans, end of year	$	(131.7	)	$	(190.7	)	$	(84.7	)	$	(115.0	)	$	(40.5	)	$	(66.6	)

	*Spire*						*Spire Missouri*						*Spire Alabama*
	*2022*			*2021*			*2022*			*2021*			*2022*			*2021*
Fair value of plan assets at beginning of year	$	326.9		$	291.0		$	221.7		$	199.2		$	99.4		$	87.0
Actual return on plan assets		(51.6	)		49.7			(36.2	)		33.1			(14.3	)		15.6
Employer contributions		0.4			0.1			0.4			0.1			—			—
Benefits paid		(11.0	)		(13.9	)		(9.2	)		(10.7	)		(1.8	)		(3.2	)
Fair value of plan assets, end of year	$	264.7		$	326.9		$	176.7		$	221.7		$	83.3		$	99.4
Funded status of plans, end of year	$	116.6		$	122.7		$	61.9		$	70.0		$	53.4		$	51.4

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

	*Spire*						*Spire Missouri*						*Spire Alabama*
	*2022*			*2021*			*2022*			*2021*			*2022*			*2021*
Net actuarial loss	$	132.0		$	194.6		$	93.6		$	129.6		$	41.2		$	66.1
Prior service credit		(35.7	)		(40.3	)		(18.1	)		(20.1	)		(16.3	)		(18.7	)
Subtotal		96.3			154.3			75.5			109.5			24.9			47.4
Adjustments for amounts included in regulatory assets		(93.1	)		(149.5	)		(72.3	)		(104.7	)		(24.9	)		(47.4	)
Total	$	3.2		$	4.8		$	3.2		$	4.8		$	—		$	—

	*Spire*						*Spire Missouri*						*Spire Alabama*
	*2022*			*2021*			*2022*			*2021*			*2022*			*2021*
Net actuarial gain	$	(83.3	)	$	(101.2	)	$	(74.2	)	$	(85.8	)	$	(5.6	)	$	(11.5	)
Prior service cost (credit)		7.1			14.6			7.9			9.7			(0.8	)		4.9
Subtotal		(76.2	)		(86.6	)		(66.3	)		(76.1	)		(6.4	)		(6.6	)
Adjustments for amounts included in regulatory assets		76.2			86.6			66.3			76.1			6.4			6.6
Total	$	—		$	—		$	—		$	—		$	—		$	—

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

	*Spire*				*Spire Missouri*				*Spire Alabama*
	*2022*		*2021*		*2022*		*2021*		*2022*		*2021*
Projected benefit obligation	$	464.4	$	689.6	$	320.6	$	479.0	$	97.8	$	149.4
Accumulated benefit obligation		457.1		673.3		315.0		465.4		96.2		146.9
Fair value of plan assets		332.7		498.9		235.9		364.0		57.3		82.8

Schedule of Expected Benefit Payments [Table Text Block]

	*2023*		*2024*		*2025*		*2026*		*2027*			*2028- 2032*
Spire	$	55.8	$	52.3	$	47.2	$	44.0	$	43.5	$	202.9
Spire Missouri		41.4		38.9		33.9		30.8		29.6		137.5
Spire Alabama		11.3		10.2		9.9		9.7		10.4		46.4

	*2023*		*2024*		*2025*		*2026*		*2027*			**2028 - 2032**
Spire	$	13.7	$	14.4	$	14.6	$	14.5	$	14.7	$	69.5
Spire Missouri		11.6		12.2		12.3		12.2		12.2		55.7
Spire Alabama		1.9		2.0		2.1		2.1		2.2		11.9

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

	*Quoted Prices*		*Significant*		*Significant*
	*in Active*		*Observable*		*Unobservable*
	*Markets*		*Inputs*		*Inputs*
	*(Level 1)*		*(Level 2)*		*(Level 3)*		*Total*
As of September 30, 2022
Cash and cash equivalents	$	11.5	$	—	$	—	$	11.5
Equity funds - global (including U.S.)		—		122.2		—		122.2
Real asset funds		—		61.0		—		61.0
Debt securities:
U.S. bond funds		42.3		—		—		42.3
U.S. government index funds		36.1		—		—		36.1
Global funds (including U.S.)		—		59.6		—		59.6
Total	$	89.9	$	242.8	$	—	$	332.7

As of September 30, 2021
Cash and cash equivalents	$	10.6	$	—	$	—	$	10.6
Equity funds - global (including U.S.)		—		201.2		—		201.2
Real asset funds		—		87.7		—		87.7
Debt securities:
U.S. bond funds		58.4		—		—		58.4
U.S. government index funds		60.1		—		—		60.1
Global funds (including U.S.)		—		80.9		—		80.9
Total	$	129.1	$	369.8	$	—	$	498.9

	*Quoted Prices*		*Significant*		*Significant*
	*in Active*		*Observable*		*Unobservable*
	*Markets*		*Inputs*		*Inputs*
	*(Level 1)*		*(Level 2)*		*(Level 3)*		*Total*
As of September 30, 2022
Cash and cash equivalents	$	3.5	$	—	$	—	$	3.5
U.S. stock/bond mutual funds		177.1		69.4		—		246.5
International fund		0.8		13.9		—		14.7
Total	$	181.4	$	83.3	$	—	$	264.7

As of September 30, 2021
Cash and cash equivalents	$	3.1	$	—	$	—	$	3.1
U.S. stock/bond mutual funds		223.2		82.5		—		305.7
International fund		1.2		16.9		—		18.1
Total	$	227.5	$	99.4	$	—	$	326.9

	*Quoted Prices*		*Significant*		*Significant*
	*in Active*		*Observable*		*Unobservable*
	*Markets*		*Inputs*		*Inputs*
	*(Level 1)*		*(Level 2)*		*(Level 3)*		*Total*
As of September 30, 2022
Cash and cash equivalents	$	5.7	$	—	$	—	$	5.7
Equity funds - global (including U.S.)		—		85.7		—		85.7
Real asset funds		—		47.2		—		47.2
Debt securities:
U.S. bond funds		29.4		—		—		29.4
U.S. government index funds		24.6		—		—		24.6
Global funds (including U.S.)		—		43.3		—		43.3
Total	$	59.7	$	176.2	$	—	$	235.9

As of September 30, 2021
Cash and cash equivalents	$	8.3	$	—	$	—	$	8.3
Equity funds - global (including U.S.)		—		148.6		—		148.6
Real asset funds		—		59.2		—		59.2
Debt securities:
U.S. bond funds		38.4		—		—		38.4
U.S. government index funds		45.6		—		—		45.6
Global funds (including U.S.)		—		63.9		—		63.9
Total	$	92.3	$	271.7	$	—	$	364.0

	*Quoted Prices*		*Significant*		*Significant*
	*in Active*		*Observable*		*Unobservable*
	*Markets*		*Inputs*		*Inputs*
	*(Level 1)*		*(Level 2)*		*(Level 3)*		*Total*
As of September 30, 2022
Cash and cash equivalents	$	2.7	$	—	$	—	$	2.7
U.S. stock/bond mutual funds		174.0		—		—		174.0
Total	$	176.7	$	—	$	—	$	176.7

As of September 30, 2021
Cash and cash equivalents	$	2.4	$	—	$	—	$	2.4
U.S. stock/bond mutual funds		219.3		—		—		219.3
Total	$	221.7	$	—	$	—	$	221.7

	*Quoted Prices*		*Significant*		*Significant*
	*in Active*		*Observable*		*Unobservable*
	*Markets*		*Inputs*		*Inputs*
	*(Level 1)*		*(Level 2)*		*(Level 3)*		*Total*
As of September 30, 2022
Cash and cash equivalents	$	3.5	$	—	$	—	$	3.5
Equity funds - global (including U.S.)		—		21.6		—		21.6
Real asset funds		—		8.1		—		8.1
Debt securities:
U.S. bond funds		7.7		—		—		7.7
U.S. government index funds		6.8		—		—		6.8
Global funds (including U.S.)		—		9.6		—		9.6
Total	$	18.0	$	39.3	$	—	$	57.3

As of September 30, 2021
Cash and cash equivalents	$	1.4	$	—	$	—	$	1.4
Equity funds - global (including U.S.)		—		32.3		—		32.3
Real asset funds		—		14.6		—		14.6
Debt securities:
U.S. bond funds		12.3		—		—		12.3
U.S. government index funds		8.9		—		—		8.9
Global funds (including U.S.)		—		13.3		—		13.3
Total	$	22.6	$	60.2	$	—	$	82.8

	*Quoted Prices*		*Significant*		*Significant*
	*in Active*		*Observable*		*Unobservable*
	*Markets*		*Inputs*		*Inputs*
	*(Level 1)*		*(Level 2)*		*(Level 3)*		*Total*
As of September 30, 2022
U.S. stock/bond mutual funds	$	—	$	69.4	$	—	$	69.4
International fund		—		13.9		—		13.9
Total	$	—	$	83.3	$	—	$	83.3

As of September 30, 2021
U.S. stock/bond mutual funds	$	—	$	82.5	$	—	$	82.5
International fund		—		16.9		—		16.9
Total	$	—	$	99.4	$	—	$	99.4