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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 228.3 | $ 278.6 | $ 203.0
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 163.0 | 188.4 | 143.1
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 3.5 | 39.5 | 2.4
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 61.8 | $ 50.7 | $ 57.5

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