CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net Income	$ 67.0	$ 67.3
Cash flow hedging derivative instruments:
Net hedging gain (loss) arising during the period	18.9	(10.4)
Amounts reclassified into net income	(0.3)	(0.3)
Net gain (loss) on cash flow hedging derivative instruments	18.6	(10.7)
Other Comprehensive Income (Loss), Before Tax	18.6	(10.7)
Income Tax Expense (Benefit) Related to Items of Other Comprehensive Income (Loss)	4.2	(2.5)
Other Comprehensive Income (Loss), Net of Tax	14.4	(8.2)
Comprehensive Income	81.4	59.1
Operating Revenues:
Gas Utility	530.6	573.8
Total Operating Revenues	566.9	602.0
Gas Utility
Natural and propane gas	214.6	251.7
Other operation and maintenance expenses	106.0	102.5
Depreciation and amortization	46.4	43.7
Taxes, other than income taxes	37.9	39.2
Total Operating Expenses	464.6	496.9
Operating Income	102.3	105.1
Interest Expense, Net	26.7	25.9
Other Income (Expense), Net	5.7	2.8
Income Before Income Taxes	81.3	82.0
Income Tax Expense	14.3	14.7
Net Income	67.0	67.3
Spire Missouri
Net Income	48.0	51.2
Cash flow hedging derivative instruments:
Other Comprehensive Income (Loss), Net of Tax	0.1
Comprehensive Income	48.1	51.2
Operating Revenues:
Gas Utility	374.0	413.2
Total Operating Revenues	374.0	413.2
Gas Utility
Natural and propane gas	185.8	223.4
Other operation and maintenance expenses	65.5	63.1
Depreciation and amortization	29.0	27.2
Taxes, other than income taxes	26.7	28.1
Total Operating Expenses	307.0	341.8
Operating Income	67.0	71.4
Interest Expense, Net	13.2	12.1
Other Income (Expense), Net	1.0	(0.7)
Income Before Income Taxes	54.8	58.6
Income Tax Expense	6.8	7.4
Net Income	$ 48.0	$ 51.2