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Note 14 - Information by Operating Segment - Total Assets by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Total Assets	$ 10,083.7	$ 9,356.4	$ 8,241.2
Operating Segments [Member] | Gas Utility [Member]
Total Assets	8,042.8	7,615.4	6,716.2
Operating Segments [Member] | Gas Marketing [Member]
Total Assets	638.7	466.1	182.7
Operating Segments [Member] | Midstream [Member]
Total Assets	446.0	413.8	388.8
Operating Segments [Member] | Other Segments [Member]
Total Assets	2,705.5	2,193.3	2,313.5
Consolidation, Eliminations [Member]
Total Assets	$ (1,749.3)	$ (1,332.2)	$ (1,360.0)

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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