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Inventories - Schedule of Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
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Public Utilities, Inventory |  |
Total inventories | $ 318.2 | $ 278.6
Non-utility LPG and natural gas |  |
Public Utilities, Inventory |  |
Total inventories | 231.7 | 188.4
Gas Utility natural gas |  |
Public Utilities, Inventory |  |
Total inventories | 37.3 | 39.5
Materials, supplies and other |  |
Public Utilities, Inventory |  |
Total inventories | $ 49.2 | $ 50.7

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