PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)

12 Months Ended

Sep. 30, 2017

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, 2017
Cash and cash equivalents	$	37.3		$	—	$	—	$	37.3
Equity mutual funds - domestic	42.1			25.4		—		67.5
Equity mutual funds - international	37.4			11.2		—		48.6
Debt securities:
US bond mutual funds	34.4			68.5		—		102.9
US government	33.2			4.5		—		37.7
US corporate	183.7			—		—		183.7
US municipal	4.2			—		—		4.2
International	45.1			7.2		—		52.3
Derivatives and margin (payable)	(2.6		)	—		—		(2.6		)
Total	$	414.8		$	116.8	$	—	$	531.6
As of September 30, 2016
Cash and cash equivalents	$	51.2		$	—	$	—	$	51.2
Stock/bond mutual funds	99.3			26.7		0.1		126.1
Debt securities:
US bond mutual funds	23.0			126.0		—		149.0
US government	42.1			3.0		—		45.1
US corporate	137.4			—		—		137.4
US municipal	6.3			—		—		6.3
International	25.3			—		—		25.3
Derivatives and margin (payable)	(1.0		)	1.1		—		0.1
Total	$	383.6		$	156.8	$	0.1	$	540.5

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, 2017
Cash and cash equivalents	$	4.0	$	—	$	—	$	4.0
US stock/bond mutual funds	174.1		71.7		—		245.8
International fund	1.0		14.7		—		15.7
Total	$	179.1	$	86.4	$	—	$	265.5
As of September 30, 2016
Cash and cash equivalents	$	4.8	$	—	$	—	$	4.8
US stock/bond mutual funds	157.9		68.5		—		226.4
International fund	0.9		14.3		—		15.2
Total	$	163.6	$	82.8	$	—	$	246.4

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
	2017			2016			2015			2017			2016			2015			2017			2016			2015
Service cost – benefits earned during the period	$	20.5		$	15.3		$	17.3		$	12.7		$	10.0		$	11.5		$	6.2		$	5.3		$	5.8
Interest cost on projected benefit obligation	27.9			28.0			29.5			19.5			21.7			23.3			6.1			6.3			6.2
Expected return on plan assets	(38.5		)	(34.9		)	(37.4		)	(28.1		)	(26.7		)	(29.2		)	(7.2		)	(8.2		)	(8.2		)
Amortization of prior service cost	1.0			0.4			0.5			1.0			0.4			0.5			—			—			—
Amortization of actuarial loss	12.5			8.0			7.5			10.7			7.9			7.5			1.8			0.1			—
Loss on lump-sum settlements and curtailments	17.9			3.3			19.6			13.5			—			18.0			4.6			3.3			1.6
Special termination benefits	0.9			1.6			—			—			1.6			—			—			—			—
Subtotal	42.2			21.7			37.0			29.3			14.9			31.6			11.5			6.8			5.4
Regulatory adjustment	(2.4		)	17.8			(2.1		)	(4.1		)	11.7			(5.2		)	1.8			6.1			3.1
Net pension cost	$	39.8		$	39.5		$	34.9		$	25.2		$	26.6		$	26.4		$	13.3		$	12.9		$	8.5

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
	2017			2016			2015			2017			2016			2015			2017			2016			2015
Current year actuarial loss	$	14.1		$	46.8		$	48.3		$	14.8		$	21.6		$	26.0		$	3.3		$	25.2		$	22.3
Amortization of actuarial loss	(12.5		)	(8.0		)	(7.5		)	(10.7		)	(7.9		)	(7.5		)	(1.8		)	(0.1		)	—
Acceleration of loss recognized due to settlement	(18.2		)	(3.3		)	(19.6		)	(13.5		)	—			(18.0		)	(4.5		)	(3.3		)	(1.6		)
Current year service cost	—			5.0			—			—			5.0			—			—			—			—
Current year prior year service cost	(20.7		)	—			—			—			—			—			(20.7		)	—			—
Amortization of prior service cost	(1.0		)	(0.4		)	(0.5		)	(1.0		)	(0.4		)	(0.5		)	—			—			—
Subtotal	(38.3		)	40.1			20.7			(10.4		)	18.3			—			(23.7		)	21.8			20.7
Regulatory adjustment	38.0			(39.8		)	(21.2		)	10.1			(18.0		)	(0.5		)	23.7			(21.8		)	(20.7		)
Total recognized in OCI	$	(0.3	)	$	0.3		$	(0.5	)	$	(0.3	)	$	0.3		$	(0.5	)	$	—		$	—		$	—

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
	2017			2016			2017			2016			2017			2016
Benefit obligation, beginning of year	$	794.7		$	652.3		$	560.0		$	497.6		$	174.3		$	154.7
Service cost	20.5			15.3			12.7			10.0			6.2			5.3
Interest cost	27.9			28.0			19.5			21.7			6.1			6.3
Actuarial (gain) loss	(0.9		)	85.8			(0.5		)	59.2			1.6			26.6
Plan amendments	(20.7		)	5.1			—			5.1			(20.7		)	—
Spire EnergySouth acquisition	—			60.4			—			—			—			—
Settlement loss	14.6			1.1			12.2			—			2.4			1.1
Special termination benefits	0.9			1.6			—			1.6			—			—
Settlement benefits paid	(62.2		)	(16.6		)	(43.5		)	—			(18.7		)	(16.6		)
Regular benefits paid	(26.0		)	(38.3		)	(20.8		)	(35.2		)	(3.0		)	(3.1		)
Benefit obligation, end of year	$	748.8		$	794.7		$	539.6		$	560.0		$	148.2		$	174.3
Accumulated benefit obligation, end of year	$	701.4		$	724.5		$	500.4		$	517.7		$	142.8		$	149.8

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
	2017			2016			2017			2016			2017			2016
Fair value of plan assets, beginning of year	$	540.5		$	448.9		$	395.7		$	339.9		$	100.0		$	109.0
Actual return on plan assets	38.0			75.1			25.1			64.4			7.7			10.7
Employer contributions	41.3			26.6			29.4			26.6			11.9			—
Spire EnergySouth acquisition	—			44.8			—			—			—			—
Settlement benefits paid	(62.2		)	(16.6		)	(43.5		)	—			(18.7		)	(16.6		)
Regular benefits paid	(26.0		)	(38.3		)	(20.8		)	(35.2		)	(3.0		)	(3.1		)
Fair value of plan assets, end of year	$	531.6		$	540.5		$	385.9		$	395.7		$	97.9		$	100.0
Funded status of plans, end of year	$	(217.2	)	$	(254.2	)	$	(153.7	)	$	(164.3	)	$	(50.3	)	$	(74.3	)

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
	2017			2016			2017			2016			2017			2016
Current liabilities	$	(0.5	)	$	(0.6	)	$	(0.5	)	$	(0.6	)	$	—		$	—
Noncurrent liabilities	(216.7		)	(253.6		)	(153.2		)	(163.7		)	(50.3		)	(74.3		)
Total	$	(217.2	)	$	(254.2	)	$	(153.7	)	$	(164.3	)	$	(50.3	)	$	(74.3	)

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
	2017			2016			2017			2016			2017			2016
Net actuarial loss	$	163.0		$	179.4		$	126.2		$	135.5		$	40.9		$	43.9
Prior service (credit) cost	(13.4		)	8.2			7.3			8.2			(20.7		)	—
Subtotal	149.6			187.6			133.5			143.7			20.2			43.9
Adjustments for amounts included in regulatory assets	(147.1		)	(184.8		)	(131.0		)	(140.9		)	(20.2		)	(43.9		)
Total	$	2.5		$	2.8		$	2.5		$	2.8		$	—		$	—

Pre-tax amounts amortized from accumulated other comprehensive income into net periodic cost

At September 30, 2017, the following pre-tax amounts are expected to be amortized from accumulated other comprehensive loss into net periodic pension cost during fiscal 2018:

	Spire			Spire Missouri			Spire Alabama
Amortization of net actuarial loss	$	12.6		$	10.5		$	2.1
Amortization of prior service (credit) cost	(0.9		)	0.9			(1.8		)
Subtotal	11.7			11.4			0.3
Regulatory adjustment	(11.4		)	(11.1		)	(0.3		)
Total	$	0.3		$	0.3		$	—

Assumptions used to calculate net periodic cost and benefit obligations.

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

	2017	2016
Weighted average discount rate - Spire Missouri East plans	3.75%	3.50%
Weighted average discount rate - Spire Missouri West plans	3.70%	3.50%
Weighted average discount rate - Spire Alabama plans	3.65%/3.70%	3.45%/3.50%
Weighted average rate of future compensation increase	3.00%	3.00%

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

	2017	2016	2015
Weighted average discount rate - Spire Missouri East plans	3.50%	4.40%	4.30%
Weighted average discount rate - Spire Missouri West plans	3.50%	4.50%	4.45%
Weighted average rate of future compensation increase	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets	7.75%	7.75%	7.75%

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

	2017	2016	2015
Weighted average discount rate	3.45%/3.50%	4.25%/4.30%	4.15%/4.25%
Weighted average rate of future compensation increase	3.00%	3.00%	2.92%
Expected long-term rate of return on plan assets	7.25%	7.50%	7.00%/7.25%

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
	2017		2016		2017		2016		2017		2016
Projected benefit obligation	$	748.8	$	794.7	$	539.6	$	560.0	$	148.2	$	174.3
Accumulated benefit obligation	701.4		724.5		500.4		517.7		142.8		149.8
Fair value of plan assets	531.6		540.5		385.9		395.7		97.9		100.0

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	2017 Target		2017 Actual		2016 Target		2016 Actual
Equity markets	56.4	%	56.8	%	56.2	%	56.9	%
Debt securities	43.6	%	42.0	%	43.8	%	43.1	%
Cash equivalents	—	%	1.2	%	—	%	—	%
Total	100.0	%	100.0	%	100.0	%	100.0	%

Spire Alabama	2017 Target		2017 Actual		2016 Target		2016 Actual
Equity markets	60.0	%	58.5	%	60.0	%	59.2	%
Debt securities	29.0	%	28.7	%	29.0	%	28.8	%
Other*	11.0	%	12.8	%	11.0	%	12.0	%
Total	100.0	%	100.0	%	100.0	%	100.0	%

* Includes cash and funds invested in real estate, commodities, natural resources and inflation-protected securities.

Expected benefit payments for the 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:

	2018		2019		2020		2021		2022		2023- 2027
Spire	$	63.5	$	63.2	$	63.2	$	58.1	$	57.9	$	281.1
Spire Missouri	50.7		49.5		49.1		43.5		42.1		198.1
Spire Alabama	10.3		11.1		11.5		11.9		13.0		67.8

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
	2017			2016			2015			2017			2016			2015			2017			2016			2015
Service cost – benefits earned during the period	$	11.0		$	10.9		$	12.8		$	10.4		$	10.6		$	12.3		$	0.3		$	0.3		$	0.5
Interest cost on accumulated postretirement benefit obligation	8.6			10.2			11.2			6.8			8.1			8.6			1.6			2.1			2.6
Expected return on plan assets	(13.6		)	(13.5		)	(13.2		)	(9.0		)	(8.5		)	(8.1		)	(4.4		)	(5.0		)	(5.1		)
Amortization of prior service cost (credit)	—			0.3			0.8			0.2			0.3			0.8			(0.2		)	—			—
Amortization of actuarial loss (gain)	2.5			3.6			5.1			2.6			3.8			5.1			(0.1		)	(0.2		)	—
Special termination benefits	—			2.6			—			—			2.6			—			—			—			—
Subtotal	8.5			14.1			16.7			11.0			16.9			18.7			(2.8		)	(2.8		)	(2.0		)
Regulatory adjustment	(3.2		)	(6.6		)	(11.0		)	(1.5		)	(4.8		)	(9.2		)	(1.8		)	(1.8		)	(1.8		)
Net postretirement benefit cost	$	5.3		$	7.5		$	5.7		$	9.5		$	12.1		$	9.5		$	(4.6	)	$	(4.6	)	$	(3.8	)

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
	2017			2016			2015			2017			2016			2015			2017			2016			2015
Current year actuarial (gain) loss	$	(34.1	)	$	0.8		$	(8.5	)	$	(28.5	)	$	1.4		$	(2.4	)	$	(4.5	)	$	(0.6	)	$	(6.1	)
Amortization of actuarial (loss) gain	(2.5		)	(3.6		)	(5.1		)	(2.6		)	(3.8		)	(5.1		)	0.1			0.2			—
Current year prior service credit	(1.4		)	(1.8		)	(4.9		)	—			—			(4.9		)	(1.4		)	(1.8		)	—
Amortization of prior service (cost) credit	—			(0.3		)	(0.8		)	(0.2		)	(0.3		)	(0.8		)	0.2			—			—
Subtotal	(38.0		)	(4.9		)	(19.3		)	(31.3		)	(2.7		)	(13.2		)	(5.6		)	(2.2		)	(6.1		)
Regulatory adjustment	38.0			4.9			19.3			31.3			2.7			13.2			5.6			2.2			6.1
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
	2017			2016			2017			2016			2017			2016
Benefit obligation, beginning of year	$	259.2		$	239.2		$	207.9		$	191.9		$	45.4		$	47.3
Service cost	11.0			10.9			10.4			10.6			0.3			0.3
Interest cost	8.6			10.2			6.8			8.1			1.6			2.1
Actuarial (gain) loss	(22.1		)	7.1			(20.9		)	6.7			—			0.4
Plan amendments	(1.4		)	(1.8		)	—			—			(1.4		)	(1.8		)
Spire EnergySouth acquisition	—			5.9			—			—			—			—
Special termination benefits	—			2.6			—			2.6			—			—
Curtailments	0.4			—			—			—			—			—
Retiree drug subsidy program	0.3			0.2			0.3			—			—			0.2
Gross benefits paid	(17.5		)	(15.1		)	(12.0		)	(12.0		)	(5.3		)	(3.1		)
Benefit obligation, end of year	$	238.5		$	259.2		$	192.5		$	207.9		$	40.6		$	45.4

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
	2017			2016			2017			2016			2017			2016
Fair value of plan assets at beginning of year	$	246.4		$	223.3		$	159.7		$	143.6		$	82.8		$	79.7
Actual return on plan assets	26.2			19.9			16.8			13.8			8.9			6.2
Employer contributions	10.4			14.3			10.4			14.3			—			—
Spire EnergySouth acquisition	—			4.0			—			—			—			—
Gross benefits paid	(17.5		)	(15.1		)	(12.0		)	(12.0		)	(5.3		)	(3.1		)
Fair value of plan assets, end of year	$	265.5		$	246.4		$	174.9		$	159.7		$	86.4		$	82.8
Funded status of plans, end of year	$	27.0		$	(12.8	)	$	(17.6	)	$	(48.2	)	$	45.8		$	37.4

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
	2017			2016			2017			2016			2017		2016
Current assets	$	1.4		$	0.3		$	1.4		$	0.3		$	—	$	—
Noncurrent assets	47.0			37.4			1.2			—			45.8		37.4
Current liabilities	(0.4		)	(0.4		)	(0.4		)	(0.4		)	—		—
Noncurrent liabilities	(21.0		)	(50.1		)	(19.8		)	(48.1		)	—		—
Total	$	27.0		$	(12.8	)	$	(17.6	)	$	(48.2	)	$	45.8	$	37.4

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
	2017			2016			2017			2016			2017			2016
Net actuarial loss (gain)	$	1.5		$	38.0		$	12.3		$	43.4		$	(9.7	)	$	(5.4	)
Prior service credit	(6.6		)	(5.2		)	(3.7		)	(3.4		)	(2.9		)	(1.8		)
Subtotal	(5.1		)	32.8			8.6			40.0			(12.6		)	(7.2		)
Adjustments for amounts included in regulatory assets	5.1			(32.8		)	(8.6		)	(40.0		)	12.6			7.2
Total	$	—		$	—		$	—		$	—		$	—		$	—

Pre-tax amounts amortized from accumulated other comprehensive income into net periodic cost

At September 30, 2017, the following pre-tax amounts are expected to be amortized from accumulated other comprehensive loss into net periodic postretirement benefit cost during fiscal 2018:

	Spire			Spire Missouri			Spire Alabama
Amortization of net actuarial loss	$	0.9		$	0.9		$	—
Amortization of prior service (credit) cost	(0.1		)	0.3			(0.4		)
Subtotal	0.8			1.2			(0.4		)
Regulatory adjustment	(0.8		)	(1.2		)	0.4
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:

	2017	2016	2015
Weighted average discount rate - Spire Missouri East plans	3.15%	4.00%	4.15%
Weighted average discount rate - Spire Missouri West plans	3.45%	4.30%	4.40%
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	5.75%/7.75%	6.00%/7.75%	6.25%/7.75%
Expected long-term rate of return on plan assets - Spire Missouri West plans	5.50%	4.75%	5.00%

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

	2017	2016	2015
Weighted average discount rate	3.60%	4.50%	4.40%
Expected long-term rate of return on plan assets	4.00%/6.25%	4.50%/7.25%	4.75%/7.50%

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

	2017	2016
Weighted average discount rate - Spire Alabama plans	3.80%	3.60%
Weighted average discount rate - Spire Missouri East plans	3.60%	3.15%
Weighted average discount rate - Spire Missouri West plans	3.60%	3.45%
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		2017 Actual		2016 Actual
Equity securities	60.0	%	59.0	%	59.1	%
Debt securities	40.0	%	39.4	%	39.4	%
Other (cash and cash equivalents held to make benefit payments)	—	%	1.6	%	1.5	%
Total	100.0	%	100.0	%	100.0	%

Spire Alabama	Target		2017 Actual		2016 Actual
Equity securities	60.0	%	60.1	%	60.5	%
Debt securities	40.0	%	39.9	%	39.5	%
Total	100.0	%	100.0	%	100.0	%

Expected benefit payments for the 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:

	2018		2019		2020		2021		2022		2023- 2027
Spire	$	15.0	$	16.0	$	17.1	$	18.3	$	18.9	$	101.3
Spire Missouri	11.8		12.8		14.0		15.2		15.9		86.5
Spire Alabama	2.8		2.8		2.8		2.8		2.7		13.0

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:

	2017	2016
Medical cost trend assumed for next year - Spire Missouri	7.25%	7.50%
Medical cost trend assumed for next year - Spire Alabama	7.25%	7.50%
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	2023	2023

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	$	1.7	$	(1.4	)	$	1.6	$	(1.3	)	$	0.1	$	(0.1	)
Accumulated postretirement benefit obligation	10.0		(9.2		)	8.0		(7.4		)	1.4		(1.3		)

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 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, 2017
Cash and cash equivalents	$	3.4	$	—	$	—	$	3.4
Equity mutual funds - domestic	28.4		9.1		—		37.5
Equity mutual funds - international	25.2		3.7		—		28.9
Debt securities:
US bond mutual funds	23.2		—		—		23.2
International	—		4.9		—		4.9
Total	$	80.2	$	17.7	$	—	$	97.9
As of September 30, 2016
Cash and cash equivalents	$	0.4	$	—	$	—	$	0.4
Stock/bond mutual funds	59.0		11.9		—		70.9
Debt securities:
US bond mutual funds	23.0		5.7		—		28.7
Total	$	82.4	$	17.6	$	—	$	100.0

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, 2017
US stock/bond mutual funds	$	—	$	71.7	$	—	$	71.7
International fund	—		14.7		—		14.7
Total	$	—	$	86.4	$	—	$	86.4
As of September 30, 2016
US stock/bond mutual funds	$	—	$	68.5	$	—	$	68.5
International fund	—		14.3		—		14.3
Total	$	—	$	82.8	$	—	$	82.8

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, 2017
Cash and cash equivalents	$	31.7		$	—	$	—	$	31.7
Equity mutual funds - domestic	—			11.9		—		11.9
Equity mutual funds - international	—			5.7		—		5.7
Debt securities:
US bond mutual funds	—			68.5		—		68.5
US government	33.2			4.5		—		37.7
US corporate	183.7			—		—		183.7
US municipal	4.2			—		—		4.2
International	45.1			—		—		45.1
Derivatives and margin (payable)	(2.6		)	—		—		(2.6		)
Total	$	295.3		$	90.6	$	—	$	385.9
As of September 30, 2016
Cash and cash equivalents	$	46.5		$	—	$	—	$	46.5
Stock/bond mutual funds	—			14.8		0.1		14.9
Debt securities:
US bond mutual funds	—			120.2		—		120.2
US government	42.1			3.0		—		45.1
US corporate	137.4			—		—		137.4
US municipal	6.3			—		—		6.3
International	25.2			—		—		25.2
Derivatives and margin (payable)	(1.0		)	1.1		—		0.1
Total	$	256.5		$	139.1	$	0.1	$	395.7

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, 2017
Cash and cash equivalents	$	3.9	$	—	$	—	$	3.9
US stock/bond mutual funds	171.0		—		—		171.0
Total	$	174.9	$	—	$	—	$	174.9
As of September 30, 2016
Cash and cash equivalents	$	4.6	$	—	$	—	$	4.6
US stock/bond mutual funds	155.1		—		—		155.1
Total	$	159.7	$	—	$	—	$	159.7