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Revenue from Contracts with Customers - Disaggregation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 2,201.9 $ 2,577.5 $ 4,177.7 $ 4,752.7
Other revenue 27.0 28.6 57.8 53.6
Total revenues 2,228.9 2,606.1 4,235.5 4,806.3
Negative surcharge   10.5   14.6
Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 211.5 240.3 395.6 416.0
Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 95.1 100.7 163.0 168.3
Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 41.4 44.1 82.7 83.6
Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 22.8 21.9 39.2 37.1
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4.5 (3.3) 8.9 (2.8)
Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 375.3 403.7 689.4 702.2
Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,194.3 1,405.6 2,288.7 2,635.3
Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 74.0 93.8 139.8 153.8
Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 419.1 552.1 782.0 1,021.0
Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 45.1 22.4 88.3 41.8
Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2.8 8.1 6.7 10.1
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1.7 0.7 3.5 1.7
Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7.8 11.6 16.6 23.3
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 81.8 79.5 162.7 163.5
Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,826.6 2,173.8 3,488.3 4,050.5
Eliminations (a)        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (93.8) (124.1) (172.7) (234.6)
Other revenue (0.7) (0.7) (1.5) (1.8)
Total revenues (94.5) (124.8) (174.2) (236.4)
Eliminations (a) | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (15.9) (24.5) (30.0) (47.4)
Eliminations (a) | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (0.6) (0.8) (1.2) (1.5)
Eliminations (a) | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (16.5) (25.3) (31.2) (48.9)
Eliminations (a) | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (22.3) (46.4) (47.9) (93.9)
Eliminations (a) | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (54.3) (51.7) (92.0) (90.4)
Eliminations (a) | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations (a) | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (0.7) (0.7) (1.6) (1.4)
Eliminations (a) | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (77.3) (98.8) (141.5) (185.7)
Eliminations (a) | AmeriGas Propane        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Eliminations (a) | UGI International        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Eliminations (a) | Midstream and Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues 77.4 98.8 141.6 185.7
Eliminations (a) | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues 16.5 25.3 31.2 48.9
Operating Segments | AmeriGas Propane        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 786.9 956.9 1,499.3 1,760.4
Other revenue 15.1 14.7 33.1 31.4
Total revenues 802.0 971.6 1,532.4 1,791.8
Operating Segments | AmeriGas Propane | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 712.2 874.6 1,343.4 1,596.5
Operating Segments | AmeriGas Propane | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 18.8 25.2 40.8 46.2
Operating Segments | AmeriGas Propane | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | AmeriGas Propane | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 55.9 57.1 115.1 117.7
Operating Segments | AmeriGas Propane | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 786.9 956.9 1,499.3 1,760.4
Operating Segments | UGI International        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 699.2 775.0 1,342.4 1,477.3
Other revenue 4.2 8.2 12.4 16.6
Total revenues 703.4 783.2 1,354.8 1,493.9
Operating Segments | UGI International | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 482.1 531.0 945.3 1,038.8
Operating Segments | UGI International | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 55.2 68.6 99.0 107.6
Operating Segments | UGI International | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 144.5 162.7 268.4 305.8
Operating Segments | UGI International | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI International | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 17.4 12.7 29.7 25.1
Operating Segments | UGI International | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 699.2 775.0 1,342.4 1,477.3
Operating Segments | Midstream and Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 417.8 540.7 788.1 998.5
Other revenue 4.4 1.7 6.6 3.3
Total revenues 422.2 542.4 794.7 1,001.8
Operating Segments | Midstream and Marketing | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream and Marketing | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 296.9 435.8 561.5 809.1
Operating Segments | Midstream and Marketing | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 45.1 22.4 88.3 41.8
Operating Segments | Midstream and Marketing | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 57.1 59.8 98.7 100.5
Operating Segments | Midstream and Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1.7 0.7 3.5 1.7
Operating Segments | Midstream and Marketing | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7.8 11.6 16.6 23.3
Operating Segments | Midstream and Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 9.2 10.4 19.5 22.1
Operating Segments | Midstream and Marketing | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 417.8 540.7 788.1 998.5
Operating Segments | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 391.8 429.0 720.6 751.1
Other revenue 0.8 0.6 1.3 1.2
Total revenues 392.6 429.6 721.9 752.3
Operating Segments | UGI Utilities | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 211.5 240.3 395.6 416.0
Operating Segments | UGI Utilities | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 95.1 100.7 163.0 168.3
Operating Segments | UGI Utilities | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 41.4 44.1 82.7 83.6
Operating Segments | UGI Utilities | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 38.7 46.4 69.2 84.5
Operating Segments | UGI Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5.1 (2.5) 10.1 (1.3)
Operating Segments | UGI Utilities | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 391.8 429.0 720.6 751.1
Operating Segments | UGI Utilities | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | UGI Utilities | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Other revenue 3.2 4.1 5.9 2.9
Total revenues 3.2 4.1 5.9 2.9
Corporate & Other | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Corporate & Other | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 0.0 $ 0.0 $ 0.0 $ 0.0