CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Net Income	$ 133.6	$ 154.6	$ 200.6	$ 221.9
Cash flow hedging derivative instruments:
Net hedging loss arising during the period	(41.1)	(7.7)	(22.2)	(18.1)
Amounts reclassified into net income	(2.2)	(0.4)	(2.5)	(0.7)
Net loss on cash flow hedging derivative instruments	(43.3)	(8.1)	(24.7)	(18.8)
Net (loss) gain on defined benefit pension and other postretirement plans	(0.1)	0.1	(0.1)	0.1
Net unrealized gain on available for sale securities		0.1		0.1
Other Comprehensive Loss, Before Tax	(43.4)	(7.9)	(24.8)	(18.6)
Income Tax Benefit Related to Items of Other Comprehensive Income (Loss)	(9.7)	(1.9)	(5.5)	(4.4)
Other Comprehensive Loss, Net of Tax	(33.7)	(6.0)	(19.3)	(14.2)
Comprehensive Income	99.9	148.6	181.3	207.7
Operating Revenues:
Gas Utility	679.1	776.7	1,209.7	1,350.5
Total Operating Revenues	715.5	803.5	1,282.4	1,405.5
Gas Utility
Natural and propane gas	249.0	337.4	463.6	589.1
Other operation and maintenance expenses	93.1	109.5	199.1	212.0
Depreciation and amortization	47.0	44.4	93.4	88.1
Taxes, other than income taxes	51.7	57.4	89.6	96.6
Total Operating Expenses	505.0	594.0	969.6	1,090.9
Operating Income	210.5	209.5	312.8	314.6
Interest Expense, Net	27.2	27.6	53.9	53.5
Other (Expense) Income, Net	(19.5)	6.1	(13.8)	8.9
Income Before Income Taxes	163.8	188.0	245.1	270.0
Income Tax Expense	30.2	33.4	44.5	48.1
Net Income	133.6	154.6	200.6	221.9
Other Comprehensive Loss, Net of Tax	(33.7)	(6.0)	(19.3)	(14.2)
Comprehensive Income	99.9	148.6	181.3	207.7
Spire Missouri
Net Income	74.5	80.0	122.5	131.2
Cash flow hedging derivative instruments:
Other Comprehensive Loss, Net of Tax	(0.2)		(0.1)
Comprehensive Income	74.3	80.0	122.4	131.2
Operating Revenues:
Gas Utility	457.5	556.6	831.5	969.8
Total Operating Revenues	457.5	556.6	831.5	969.8
Gas Utility
Natural and propane gas	223.6	313.8	409.4	537.2
Other operation and maintenance expenses	50.8	70.7	116.3	133.8
Depreciation and amortization	29.3	27.8	58.3	55.0
Taxes, other than income taxes	36.1	41.9	62.8	70.0
Total Operating Expenses	339.8	454.2	646.8	796.0
Operating Income	117.7	102.4	184.7	173.8
Interest Expense, Net	12.7	13.2	25.9	25.3
Other (Expense) Income, Net	(20.9)	2.5	(19.9)	1.8
Income Before Income Taxes	84.1	91.7	138.9	150.3
Income Tax Expense	9.6	11.7	16.4	19.1
Net Income	74.5	80.0	122.5	131.2
Other Comprehensive Loss, Net of Tax	(0.2)		(0.1)
Comprehensive Income	$ 74.3	$ 80.0	$ 122.4	$ 131.2