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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Inventory |  |  |
Inventory, net | $ 176.5 | $ 239.9 | $ 201.5
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Inventory, net | 106.7 | 140.7 | 135.8
Gas Utility natural gas |  |  |
Inventory |  |  |
Inventory, net | 3.8 | 37.5 | 6.3
Materials, supplies and other |  |  |
Inventory |  |  |
Inventory, net | $ 66.0 | $ 61.7 | $ 59.4

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