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Inventories - Schedule of Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Public Utilities, Inventory |  |
Total inventories | $ 278.6 | $ 210.3
Non-utility LPG and natural gas |  |
Public Utilities, Inventory |  |
Total inventories | 188.4 | 129.8
Gas Utility natural gas |  |
Public Utilities, Inventory |  |
Total inventories | 39.5 | 29.2
Materials, supplies and other |  |
Public Utilities, Inventory |  |
Total inventories | $ 50.7 | $ 51.3

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