CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues	$ 512.6	$ 566.9
Operating Expenses:
Natural gas	181.2	261.9
Operation and maintenance	111.6	116.6
Depreciation and amortization	50.8	47.5
Taxes, other than income taxes	36.1	38.6
Total Operating Expenses	379.7	464.6
Operating Income	132.9	102.3
Interest Expense, Net	25.7	26.7
Other Income, Net	4.3	5.7
Income Before Income Taxes	111.5	81.3
Income Tax Expense	22.6	14.3
Net Income	88.9	67.0
Provision for preferred dividends	3.7	3.7
Income allocated to participating securities	0.1	0.1
Net Income Available to Common Shareholders	$ 85.1	$ 63.2
Weighted Average Number of Common Shares Outstanding:
Basic	51.5	50.9
Diluted	51.6	51.1
Basic Earnings Per Common Share	$ 1.65	$ 1.24
Diluted Earnings Per Common Share	$ 1.65	$ 1.24
Spire Alabama
Operating Revenues	$ 113.6	$ 126.2
Operating Expenses:
Natural gas	35.1	47.0
Operation and maintenance	32.8	35.2
Depreciation and amortization	15.0	14.3
Taxes, other than income taxes	8.2	8.8
Total Operating Expenses	91.1	105.3
Operating Income	22.5	20.9
Interest Expense, Net	4.7	5.4
Other Income, Net	0.7	2.2
Income Before Income Taxes	18.5	17.7
Income Tax Expense	4.8	4.5
Net Income	$ 13.7	$ 13.2