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Related Party Transactions (Details) - USD ($)
3 Months Ended 20 Months Ended
Nov. 07, 2017
Dec. 31, 2017
Dec. 31, 2016
Jul. 01, 2019
Related Party Transaction        
General Partner contribution to AmeriGas Propane, L.P.   $ 0 $ 1,602,000  
General Partner | Reimbursed Expenses or Payments        
Related Party Transaction        
Related party costs and expenses   147,287,000 147,591,000  
General Partner | UGI Corp | General and Administrative Services        
Related Party Transaction        
Related party costs and expenses   3,713,000 3,684,000  
Affiliated Entity | Energy Services | Propane Purchases        
Related Party Transaction        
Related party costs and expenses   $ 0 $ 0  
Forecast        
Related Party Transaction        
General Partner contribution to AmeriGas Propane, L.P.       $ 225,000,000
Capital Unit, Class B        
Related Party Transaction        
Number of volume days of weighted average price of Partnership's common units 20 days      
Basis points on annualized yield 130.00%      
Period from initial issuance, holders may elect to convert units 5 years      
Conversion ratio 1      
Trading price (as a percent) 110.00%