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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Inventory |  |  |
Inventory, net | $ 184.2 | $ 239.9 | $ 208.7
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Inventory, net | 107.9 | 140.7 | 124.6
Gas Utility natural gas |  |  |
Inventory |  |  |
Inventory, net | 13.5 | 37.5 | 19.2
Materials, supplies and other |  |  |
Inventory |  |  |
Inventory, net | $ 62.8 | $ 61.7 | $ 64.9

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