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Nature of Operations (Details)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 21, 2019
USD ($)
shares
Aug. 20, 2019
Aug. 31, 2019
shares
Jun. 30, 2020
county
Jun. 30, 2019
USD ($)
Business Acquisition [Line Items]          
General Partner incentive distribution         $ 34.3
Number of counties of operation | county       1  
AmeriGas Propane | AmeriGas Partners          
Business Acquisition [Line Items]          
General Partner held a general partner interest in AmeriGas Partners   1.00%      
Percentage of limited partnership interest in AmeriGas Partners   25.50%      
AmeriGas Propane | AmeriGas OLP          
Business Acquisition [Line Items]          
Effective ownership interest in AmeriGas OLP   27.00%      
Merger Sub          
Business Acquisition [Line Items]          
Common stock paid in cash to acquire all outstanding common units $ 528.9        
Common Stock | Merger Sub          
Business Acquisition [Line Items]          
Shares issued in business acquisition (in shares) | shares 34,612,847   34,613,000