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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 222.0 | $ 318.2 | $ 228.3
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 159.7 | 231.7 | 163.0
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 3.4 | 37.3 | 3.5
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 58.9 | $ 49.2 | $ 61.8

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