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Inventories - Components of Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 247.5 | $ 229.9 | $ 293.7
Non-utility LPG and natural gas |  |  |
Inventory |  |  |
Total inventories | 163.7 | 150.2 | 206.7
Gas Utility natural gas |  |  |
Inventory |  |  |
Total inventories | 24.3 | 26.6 | 34.9
Materials, supplies and other |  |  |
Inventory |  |  |
Total inventories | $ 59.5 | $ 53.1 | $ 52.1

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