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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 293.7 | $ 318.2 | $ 307.3
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 206.7 | 231.7 | 216.4
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 34.9 | 37.3 | 34.6
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 52.1 | $ 49.2 | $ 56.3

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