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Employee Retirement Plans - Change in Pension Benefits and Other Postretirement Benefits Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Pension Benefits      
Change in benefit obligations:      
Benefit obligations — beginning of year $ 669.2 $ 697.8  
Service cost 9.8 11.2 $ 11.9
Interest cost 27.3 26.3 25.0
Actuarial loss (gain) 89.0 (37.0)  
Plan amendments 0.3 0.0  
Curtailment (1.3) (0.6)  
Settlements (13.1) 0.0  
Foreign currency (3.1) (1.0)  
Benefits paid (28.0) (27.5)  
Benefit obligations — end of year 750.1 669.2 697.8
Change in plan assets:      
Fair value of plan assets — beginning of year 563.3 529.2  
Actual gain on plan assets 13.0 44.9  
Foreign currency (1.5) (0.6)  
Employer contributions 12.4 16.2  
Settlements (13.1) 0.0  
Benefits paid (27.3) (26.4)  
Fair value of plan assets — end of year 546.8 563.3 529.2
Funded status of the plans — end of year (203.3) (105.9)  
Assets (liabilities) recorded in the balance sheet:      
Assets in excess of liabilities — included in other noncurrent assets 0.0 0.0  
Unfunded liabilities — included in other noncurrent liabilities (203.3) (105.9)  
Net amount recognized (203.3) (105.9)  
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax):      
Prior service cost (benefit) 1.3 0.6  
Net actuarial loss (gain) 25.4 14.0  
Total 26.7 14.6  
Amounts recorded in regulatory assets and liabilities (pre-tax):      
Prior service cost (benefit) 0.5 0.7  
Net actuarial loss (gain) 177.4 85.7  
Total 177.9 86.4  
Other Postretirement Benefits      
Change in benefit obligations:      
Benefit obligations — beginning of year 19.3 27.0  
Service cost 0.2 0.5 1.0
Interest cost 0.7 0.8 0.8
Actuarial loss (gain) 3.6 (2.1)  
Plan amendments 0.0 (5.8)  
Curtailment 0.0 (0.1)  
Settlements 0.0 0.0  
Foreign currency (0.2) 0.0  
Benefits paid (0.9) (1.0)  
Benefit obligations — end of year 22.7 19.3 27.0
Change in plan assets:      
Fair value of plan assets — beginning of year 15.3 14.8  
Actual gain on plan assets 0.9 0.9  
Foreign currency 0.0 0.0  
Employer contributions 0.4 0.4  
Settlements 0.0 0.0  
Benefits paid (0.4) (0.8)  
Fair value of plan assets — end of year 16.2 15.3 $ 14.8
Funded status of the plans — end of year (6.5) (4.0)  
Assets (liabilities) recorded in the balance sheet:      
Assets in excess of liabilities — included in other noncurrent assets 2.8 6.7  
Unfunded liabilities — included in other noncurrent liabilities (9.3) (10.7)  
Net amount recognized (6.5) (4.0)  
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax):      
Prior service cost (benefit) (1.2) (1.3)  
Net actuarial loss (gain) 0.5 (0.4)  
Total (0.7) (1.7)  
Amounts recorded in regulatory assets and liabilities (pre-tax):      
Prior service cost (benefit) (0.7) (1.2)  
Net actuarial loss (gain) 1.4 (0.1)  
Total $ 0.7 $ (1.3)