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Income Taxes (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Income Taxes          
Foreign tax credits   $ 25.6 $ 63.0 $ 12.1  
Undistributed earnings of foreign subsidiaries   81.7      
Deferred tax assets relating to operating loss carryforwards   31.5 32.5    
Valuation allowance provided for deferred tax assets related to state net operating loss carryforwards and other state deferred tax assets of certain subsidiaries   0.2      
Increase (decrease) in valuation allowance   (17.0)      
Unrecognized income tax benefits   7.2 3.2 2.4 $ 3.4
Accrued interest included in unrecognized income tax benefits   0.3      
Unrecognized tax benefits if recognized would impact the reported effective tax rate   5.8      
Accrued Interest Included          
Income Taxes          
Unrecognized income tax benefits   7.2      
State Operating Loss Carryforwards          
Income Taxes          
Increase (decrease) in valuation allowance   (5.5)      
Foreign Tax Credits          
Income Taxes          
Increase (decrease) in valuation allowance   (8.8)      
Foreign Operating Loss Carryforwards          
Income Taxes          
Increase (decrease) in valuation allowance   (2.0)      
State Operating Loss Benefits          
Income Taxes          
Increase (decrease) in valuation allowance   (6.2)      
Foreign Country          
Income Taxes          
Foreign tax credit carryforwards   105.1      
State and Local Jurisdiction          
Income Taxes          
Decrease in income tax expense due to state tax flow through of accelerated depreciation   1.3 1.5 $ 2.0  
Operating loss carryforwards   179.4      
Deferred tax assets and associated valuation allowance for unrealized state tax benefits for equity compensation deductions   7.7 $ 6.5    
UGI International Holdings BV          
Income Taxes          
Deferred tax assets relating to operating loss carryforwards   0.6      
UGI International Holdings BV | Foreign Country          
Income Taxes          
Operating loss carryforwards   2.5      
AmeriGas Propane          
Income Taxes          
Operating loss carryforwards   22.4      
Deferred tax assets relating to operating loss carryforwards   8.6      
Other Subsidiaries          
Income Taxes          
Deferred tax assets relating to operating loss carryforwards   5.0      
UGI International          
Income Taxes          
Valuation allowance operating loss carryforwards   9.0      
Flaga          
Income Taxes          
Deferred tax assets relating to operating loss carryforwards   9.7      
Flaga | Foreign Country          
Income Taxes          
Operating loss carryforwards   52.4      
UGI France          
Income Taxes          
Deferred tax assets relating to operating loss carryforwards   7.6      
UGI France | Foreign Country          
Income Taxes          
Operating loss carryforwards   $ 21.4      
France | UGI France          
Income Taxes          
Income tax expense $ 5.7