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Summary of Significant Accounting Policies - Basis of Presentation (Details)
$ in Millions
12 Months Ended
Sep. 30, 2015
USD ($)
subsidiary
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Decrease in opening retained earnings   $ (2,106.7) $ (1,834.1)
Increase in other noncurrent liabilities   774.8 806.6
Decrease in deferred income tax liabilities   $ (1,357.0) $ (1,212.4)
UGI International | Error in Cylinder Deposit Liability      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Number of subsidiaries | subsidiary 2    
UGI International | Error in Cylinder Deposit Liability | Restatement Adjustment      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Decrease in opening retained earnings $ 6.8    
Decrease in opening retained earnings (as a percent) 0.50%    
Increase in other noncurrent liabilities $ 10.6    
Decrease in deferred income tax liabilities $ 3.8