CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues:
Gas Utility	$ 1,888.0	$ 1,660.0	$ 1,457.2
Gas Marketing and other	77.0	80.7	80.1
Total Operating Revenues	1,965.0	1,740.7	1,537.3
Gas Utility
Natural and propane gas	770.1	570.5	492.2
Other operation and maintenance expenses	455.6	405.0	377.5
Depreciation and amortization	167.0	153.5	136.9
Taxes, other than income taxes	152.5	137.8	125.2
Total Gas Utility Operating Expenses	1,545.2	1,266.8	1,131.8
Gas Marketing and other	140.1	152.2	123.2
Total Operating Expenses	1,685.3	1,419.0	1,255.0
Operating Income	279.7	321.7	282.3
Other Income, Net	6.4	6.6	8.6
Interest Charges:
Interest on long-term debt	83.0	76.8	67.6
Other interest charges	15.4	12.3	9.6
Total Interest Charges	98.4	89.1	77.2
Income Before Income Taxes	187.7	239.2	213.7
Income Tax (Benefit) Expense	(26.5)	77.6	69.5
Net Income	214.2	161.6	144.2
Net Income	214.2	161.6	153.9
Other comprehensive income (loss)	2.5	7.4	(2.2)
Comprehensive Income	$ 216.7	$ 169.0	$ 142.0
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	49.1	46.9	44.1
Diluted (in shares)	49.3	47.0	44.3
Basic Earnings Per Share of Common Stock (in dollars per share)	$ 4.35	$ 3.44	$ 3.26
Diluted Earnings Per Share of Common Stock (in dollars per share)	$ 4.33	$ 3.43	$ 3.24
Spire Missouri
Operating Revenues:
Gas Utility	$ 1,285.6	$ 1,171.9	$ 1,087.5
Total Operating Revenues	1,285.6	1,171.9	1,087.5
Gas Utility
Natural and propane gas	636.8	538.3	471.3
Other operation and maintenance expenses	296.3	243.8	244.4
Depreciation and amortization	102.8	93.1	88.6
Taxes, other than income taxes	108.4	99.8	96.3
Total Operating Expenses	1,144.3	975.0	900.6
Operating Income	141.3	196.9	186.9
Other Income, Net	1.8	2.7	1.8
Interest Charges:
Interest on long-term debt	38.7	32.9	32.9
Other interest charges	7.7	6.2	4.5
Total Interest Charges	46.4	39.1	37.4
Income Before Income Taxes	96.7	160.5	151.3
Income Tax (Benefit) Expense	(32.6)	47.5	45.4
Net Income	129.3	113.0	105.9
Other comprehensive income (loss)	0.4	0.1	(0.1)
Comprehensive Income	129.7	113.1	105.8
Spire Alabama
Operating Revenues:
Gas Utility	500.7	400.5	368.5
Total Operating Revenues	500.7	400.5	368.5
Gas Utility
Natural and propane gas	176.0	84.5	67.3
Other operation and maintenance expenses	136.8	130.4	133.5
Depreciation and amortization	53.2	49.9	47.8
Taxes, other than income taxes	36.1	29.9	28.4
Total Operating Expenses	402.1	294.7	277.0
Operating Income	98.6	105.8	91.5
Other Income, Net	1.6	2.5	7.9
Interest Charges:
Interest on long-term debt	13.5	11.2	11.4
Other interest charges	3.8	3.2	2.4
Total Interest Charges	17.3	14.4	13.8
Income Before Income Taxes	82.9	93.9	85.6
Income Tax (Benefit) Expense	81.6	35.8	32.4
Net Income	$ 1.3	$ 58.1	$ 53.2