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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Public Utilities, Inventory    
Total inventories $ 318.2 $ 278.6
Non-utility LPG and natural gas    
Public Utilities, Inventory    
Total inventories 231.7 188.4
Gas Utility natural gas    
Public Utilities, Inventory    
Total inventories 37.3 39.5
Materials, supplies and other    
Public Utilities, Inventory    
Total inventories $ 49.2 $ 50.7