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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 307.3 | $ 278.6 | $ 228.2
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 216.4 | 188.4 | 150.9
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 34.6 | 39.5 | 25.8
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 56.3 | $ 50.7 | $ 51.5

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