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Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Oct. 01, 2018
Disaggregation of Revenue [Line Items]    
Contract with customer, liability $ 114.1 $ 111.2
Contract with customer, liability, revenue recognized $ 90.7  
Natural Gas Transportation and Gathering Services    
Disaggregation of Revenue [Line Items]    
Term of contract with customer 30 years  
Storage Services    
Disaggregation of Revenue [Line Items]    
Term of contract with customer 1 year  
Natural Gas    
Disaggregation of Revenue [Line Items]    
Term of contract with customer 15 years  
Midstream & Marketing    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation $ 2,000.0  
UGI Utilities    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation $ 200.0