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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 215.1 | $ 318.2 | $ 253.2
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 141.6 | 231.7 | 177.0
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 15.5 | 37.3 | 18.6
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 58.0 | $ 49.2 | $ 57.6

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