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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, 2016
Sep. 30, 2015
Sep. 30, 2014
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax):      
Net actuarial loss $ 13.0 $ 10.1  
Pension Benefit      
Change in benefit obligations:      
Benefit obligations — beginning of year 614.7 573.6  
Service cost 10.1 10.0 $ 9.4
Interest cost 26.8 25.5 26.1
Actuarial loss (gain) 83.3 14.4  
Plan amendments 0.0 (0.6)  
Curtailment (1.4) (0.8)  
Totalgaz acquisition 0.0 21.3  
Foreign currency 0.1 (4.4)  
Benefits paid (25.9) (24.3)  
Benefit obligations — end of year 707.7 614.7 573.6
Change in plan assets:      
Fair value of plan assets — beginning of year 453.8 459.4  
Actual gain (loss) on plan assets 53.4 1.1  
Foreign currency 0.1 (0.4)  
Employer contributions 11.4 11.9  
Totalgaz acquisition 0.0 6.1  
Benefits paid (25.0) (24.3)  
Fair value of plan assets — end of year 493.7 453.8 459.4
Funded status of the plans — end of year (214.0) (160.9)  
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 (214.0) (160.9)  
Net amount recognized (214.0) (160.9)  
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax):      
Prior service credit (0.6) (0.6)  
Net actuarial loss 31.4 22.5  
Total 30.8 21.9  
Amounts recorded in regulatory assets and liabilities (pre-tax):      
Prior service cost (credit) 1.2 1.6  
Net actuarial loss 181.0 138.4  
Total 182.2 140.0  
Other Postretirement Benefits      
Change in benefit obligations:      
Benefit obligations — beginning of year 25.4 21.3  
Service cost 0.7 0.7 0.5
Interest cost 0.9 0.8 0.9
Actuarial loss (gain) 6.6 (2.7)  
Plan amendments (1.5) 0.0  
Curtailment (0.3) 0.0  
Totalgaz acquisition 0.0 6.8  
Foreign currency 0.0 (0.7)  
Benefits paid (0.9) (0.8)  
Benefit obligations — end of year 30.9 25.4 21.3
Change in plan assets:      
Fair value of plan assets — beginning of year 12.5 12.8  
Actual gain (loss) on plan assets 1.3 (0.1)  
Foreign currency 0.0 0.0  
Employer contributions 0.6 0.6  
Totalgaz acquisition 0.0 0.0  
Benefits paid (0.7) (0.8)  
Fair value of plan assets — end of year 13.7 12.5 $ 12.8
Funded status of the plans — end of year (17.2) (12.9)  
Assets (liabilities) recorded in the balance sheet:      
Assets in excess of liabilities — included in other noncurrent assets 4.1 4.0  
Unfunded liabilities — included in other noncurrent liabilities (21.3) (16.9)  
Net amount recognized (17.2) (12.9)  
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax):      
Prior service credit (1.5) (0.1)  
Net actuarial loss 3.8 0.7  
Total 2.3 0.6  
Amounts recorded in regulatory assets and liabilities (pre-tax):      
Prior service cost (credit) (2.2) (2.9)  
Net actuarial loss 2.4 2.3  
Total $ 0.2 $ (0.6)