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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment    
Utilities $ 2,998.9 $ 2,753.5
Non-utility 5,346.4 5,075.6
Total property, plant and equipment 8,345.3 7,829.1
Distribution    
Property, Plant and Equipment    
Utilities 2,634.2 2,458.1
Transmission    
Property, Plant and Equipment    
Utilities 93.5 90.0
General and Other, Including Work-in-Process    
Property, Plant and Equipment    
Utilities 271.2 205.4
Land    
Property, Plant and Equipment    
Non-utility 169.9 174.9
Building and Improvements    
Property, Plant and Equipment    
Non-utility 382.2 391.4
Transportation Equipment    
Property, Plant and Equipment    
Non-utility 301.7 327.9
Equipment, Primarily Cylinders and Tanks    
Property, Plant and Equipment    
Non-utility 3,421.5 3,268.1
Electric Generation    
Property, Plant and Equipment    
Non-utility 309.4 305.7
Pipeline and Related Assets    
Property, Plant and Equipment    
Non-utility 235.8 233.5
Other, Including Work-in-Process    
Property, Plant and Equipment    
Non-utility $ 525.9 $ 374.1