CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Operating Revenues:
Gas Utility	$ 1,660.0	$ 1,457.2	$ 1,891.8
Gas Marketing and other	80.7	80.1	84.6
Total Operating Revenues	1,740.7	1,537.3	1,976.4
Gas Utility
Natural and propane gas	570.5	492.2	882.4
Other operation and maintenance expenses	405.0	377.5	390.6
Depreciation and amortization	153.5	136.9	129.9
Taxes, other than income taxes	137.8	125.2	142.1
Total Gas Utility Operating Expenses	1,266.8	1,131.8	1,545.0
Gas Marketing and other	152.2	123.2	158.9
Total Operating Expenses	1,419.0	1,255.0	1,703.9
Operating Income	321.7	282.3	272.5
Other Income – Net	6.6	8.6	1.2
Interest Charges:
Interest on long-term debt	76.8	67.6	66.6
Other interest charges	12.3	9.6	8.0
Total Interest Charges	89.1	77.2	74.6
Income Before Income Taxes	239.2	213.7	199.1
Income Tax Expense	77.6	69.5	62.2
Net Income	$ 161.6	$ 144.2	$ 136.9
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	46.9	44.1	43.2
Diluted (in shares)	47.0	44.3	43.3
Basic Earnings Per Share of Common Stock (in dollars per share)	$ 3.44	$ 3.26	$ 3.16
Diluted Earnings Per Share of Common Stock (in dollars per share)	$ 3.43	$ 3.24	$ 3.16
Spire Missouri
Operating Revenues:
Gas Utility	$ 1,171.9	$ 1,087.5	$ 1,416.6
Total Operating Revenues	1,171.9	1,087.5	1,416.6
Gas Utility
Natural and propane gas	538.3	471.3	786.1
Other operation and maintenance expenses	243.8	244.4	253.6
Depreciation and amortization	93.1	88.6	82.6
Taxes, other than income taxes	99.8	96.3	108.9
Total Operating Expenses	975.0	900.6	1,231.2
Operating Income	196.9	186.9	185.4
Other Income – Net	2.7	1.8	(0.5)
Interest Charges:
Interest on long-term debt	32.9	32.9	33.1
Other interest charges	6.2	4.5	3.3
Total Interest Charges	39.1	37.4	36.4
Income Before Income Taxes	160.5	151.3	148.5
Income Tax Expense	47.5	45.4	43.2
Net Income	113.0	105.9	105.3
Spire Alabama
Operating Revenues:
Gas Utility	400.5	368.5	479.2
Total Operating Revenues	400.5	368.5	479.2
Gas Utility
Natural and propane gas	84.5	67.3	171.5
Other operation and maintenance expenses	130.4	133.5	138.0
Depreciation and amortization	49.9	47.8	47.3
Taxes, other than income taxes	29.9	28.4	33.2
Total Operating Expenses	294.7	277.0	390.0
Operating Income	105.8	91.5	89.2
Other Income – Net	2.5	7.9	2.0
Interest Charges:
Interest on long-term debt	11.2	11.4	11.6
Other interest charges	3.2	2.4	2.3
Total Interest Charges	14.4	13.8	13.9
Income Before Income Taxes	93.9	85.6	77.3
Income Tax Expense	35.8	32.4	29.3
Net Income	$ 58.1	$ 53.2	$ 48.0