CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Operating Revenues	$ 2,235.5	$ 1,855.4	$ 1,952.4
Operating Expenses:
Natural gas	946.3	696.1	840.3
Operation and maintenance	465.8	458.6	474.1
Depreciation and amortization	213.1	197.3	181.7
Taxes, other than income taxes	160.1	148.4	154.0
Impairments	0.0	148.6	0.0
Total Operating Expenses	1,785.3	1,649.0	1,650.1
Operating Income	450.2	206.4	302.3
Interest Expense, Net	106.6	105.5	104.4
Other (Expense) Income, Net	(3.4)	0.1	21.2
Income Before Income Taxes	340.2	101.0	219.1
Income Tax Expense	68.5	12.4	34.5
Net Income	271.7	88.6	184.6
Provision for preferred dividends	14.8	14.8	5.3
Income allocated to participating securities	0.4	0.1	0.4
Net Income Available to Common Shareholders	$ 256.5	$ 73.7	$ 178.9
Weighted Average Number of Common Shares Outstanding:
Basic	51.6	51.2	50.7
Diluted	51.7	51.3	50.8
Basic Earnings Per Share of Common Stock	$ 4.97	$ 1.44	$ 3.53
Diluted Earnings Per Share of Common Stock	$ 4.96	$ 1.44	$ 3.52
Spire Alabama
Operating Revenues	$ 494.0	$ 455.0	$ 465.5
Operating Expenses:
Natural gas	145.3	118.9	135.5
Operation and maintenance	132.5	139.1	142.6
Depreciation and amortization	62.1	59.3	56.2
Taxes, other than income taxes	37.1	34.8	35.7
Total Operating Expenses	377.0	352.1	370.0
Operating Income	117.0	102.9	95.5
Interest Expense, Net	20.2	20.6	21.7
Other (Expense) Income, Net	2.0	5.4	7.0
Income Before Income Taxes	98.8	87.7	80.8
Income Tax Expense	25.0	22.0	20.5
Net Income	$ 73.8	$ 65.7	$ 60.3