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Revenue from Contracts with Customers - Disaggregation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 1,171.0 $ 1,331.8 $ 5,348.7 $ 6,084.5
Other revenue 28.3 31.9 86.1 85.5
Total revenues 1,199.3 1,363.7 5,434.8 6,170.0
Negative surcharge increase (decrease)   3.3   (11.3)
Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 103.3 78.1 498.9 494.1
Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 29.9 34.2 192.9 202.5
Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 30.5 27.8 113.2 111.4
Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4.9 4.0 44.1 41.1
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2.5 8.3 11.4 5.5
Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 171.1 152.4 860.5 854.6
Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 622.0 754.1 2,910.7 3,389.4
Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 32.4 44.5 172.2 198.3
Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 222.9 274.8 1,004.9 1,295.8
Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 39.7 17.6 128.0 59.4
Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (1.1) 3.2 5.6 13.3
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2.0 0.1 5.5 1.8
Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6.5 8.9 23.1 32.2
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 75.5 76.2 238.2 239.7
Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 999.9 1,179.4 4,488.2 5,229.9
Eliminations        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (28.3) (38.9) (201.0) (273.5)
Other revenue (0.7) (0.7) (2.2) (2.5)
Total revenues (29.0) (39.6) (203.2) (276.0)
Eliminations | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (6.9) (10.1) (36.9) (57.5)
Eliminations | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (0.6) (0.8) (1.8) (2.3)
Eliminations | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (7.5) (10.9) (38.7) (59.8)
Eliminations | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (15.7) (23.7) (63.6) (117.6)
Eliminations | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (4.6) (3.2) (96.6) (93.6)
Eliminations | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Eliminations | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (0.5) (1.1) (2.1) (2.5)
Eliminations | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (20.8) (28.0) (162.3) (213.7)
Eliminations | AmeriGas Propane        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Eliminations | UGI International        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Eliminations | Midstream & Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues 20.8 28.0 162.4 213.7
Eliminations | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues 7.5 10.9 38.7 59.8
Operating Segments | AmeriGas Propane        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 434.9 462.9 1,934.2 2,223.3
Other revenue 16.0 15.8 49.1 47.2
Total revenues 450.9 478.7 1,983.3 2,270.5
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 371.4 405.9 1,714.8 2,002.4
Operating Segments | AmeriGas Propane | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 10.3 8.8 51.1 55.0
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 53.2 48.2 168.3 165.9
Operating Segments | AmeriGas Propane | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 434.9 462.9 1,934.2 2,223.3
Operating Segments | UGI International        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 366.7 478.9 1,709.1 1,956.2
Other revenue 4.8 7.7 17.2 24.3
Total revenues 371.5 486.6 1,726.3 1,980.5
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 250.6 348.2 1,195.9 1,387.0
Operating Segments | UGI International | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 22.1 35.7 121.1 143.3
Operating Segments | UGI International | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 80.2 80.4 348.6 386.2
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 13.8 14.6 43.5 39.7
Operating Segments | UGI International | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 366.7 478.9 1,709.1 1,956.2
Operating Segments | Midstream & Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 219.1 265.6 1,007.2 1,264.1
Other revenue 3.4 1.7 10.0 5.0
Total revenues 222.5 267.3 1,017.2 1,269.1
Operating Segments | Midstream & Marketing | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream & 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 & 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 & 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 & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream & 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 & Marketing | Retail        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream & Marketing | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0.0 0.0 0.0 0.0
Operating Segments | Midstream & Marketing | Energy Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 158.4 218.1 719.9 1,027.2
Operating Segments | Midstream & Marketing | Pipeline        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 39.7 17.6 128.0 59.4
Operating Segments | Midstream & Marketing | Peaking        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3.5 6.4 102.2 106.9
Operating Segments | Midstream & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2.0 0.1 5.5 1.8
Operating Segments | Midstream & Marketing | Electricity Generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6.5 8.9 23.1 32.2
Operating Segments | Midstream & Marketing | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 9.0 14.5 28.5 36.6
Operating Segments | Midstream & Marketing | Total Non-Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 219.1 265.6 1,007.2 1,264.1
Operating Segments | UGI Utilities        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 178.6 163.3 899.2 914.4
Other revenue 0.5 0.6 1.8 1.8
Total revenues 179.1 163.9 901.0 916.2
Operating Segments | UGI Utilities | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 103.3 78.1 498.9 494.1
Operating Segments | UGI Utilities | Commercial & Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 29.9 34.2 192.9 202.5
Operating Segments | UGI Utilities | Large delivery service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 30.5 27.8 113.2 111.4
Operating Segments | UGI Utilities | Off-system sales and capacity releases        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 11.8 14.1 81.0 98.6
Operating Segments | UGI Utilities | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3.1 9.1 13.2 7.8
Operating Segments | UGI Utilities | Total Utility        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 178.6 163.3 899.2 914.4
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 4.3 6.8 10.2 9.7
Total revenues 4.3 6.8 10.2 9.7
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