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Debt - Schedule of Short-term Debt (Footnotes) (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2017
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
AmeriGas Credit Agreement | Federal Funds Effective Swap Rate          
Short-term Debt          
Basis spread on variable rate (percentage) 0.50%        
AmeriGas Credit Agreement | Base Rate | Minimum          
Short-term Debt          
Basis spread on variable rate (percentage) 0.50%        
AmeriGas Credit Agreement | Base Rate | Maximum          
Short-term Debt          
Basis spread on variable rate (percentage) 1.75%        
AmeriGas Credit Agreement | Eurodollar | Minimum          
Short-term Debt          
Basis spread on variable rate (percentage) 1.50%        
AmeriGas Credit Agreement | Eurodollar | Maximum          
Short-term Debt          
Basis spread on variable rate (percentage) 2.75%        
Letter of Credit | AmeriGas Credit Agreement | Line of Credit          
Short-term Debt          
Total capacity $ 150,000,000        
Revolving Credit Facility | AmeriGas Credit Agreement | Line of Credit          
Short-term Debt          
Total capacity 600,000,000        
AmeriGas OLP          
Short-term Debt          
Total capacity       $ 600,000,000 $ 525,000,000
AmeriGas OLP | Letter of Credit | AmeriGas Credit Agreement          
Short-term Debt          
Total capacity $ 125,000,000     150,000,000  
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Minimum          
Short-term Debt          
Facility fee (percentage)   0.30%      
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Maximum          
Short-term Debt          
Facility fee (percentage)   0.50%      
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Federal Funds Effective Swap Rate          
Short-term Debt          
Basis spread on variable rate (percentage)   0.50%      
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Base Rate | Minimum          
Short-term Debt          
Basis spread on variable rate (percentage)   0.50%      
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Base Rate | Maximum          
Short-term Debt          
Basis spread on variable rate (percentage)   1.75%      
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Eurodollar | Minimum          
Short-term Debt          
Basis spread on variable rate (percentage)   1.50%      
AmeriGas OLP | Line of Credit | AmeriGas Credit Agreement | Eurodollar | Maximum          
Short-term Debt          
Basis spread on variable rate (percentage)   2.75%      
France SAS          
Short-term Debt          
Total capacity | €   € 60,000,000 € 60,000,000    
France SAS | 2015 Senior Facilities Agreement | EURIBOR          
Short-term Debt          
Basis spread on variable rate (percentage)   1.75% 1.90%    
France SAS | 2015 Senior Facilities Agreement | EURIBOR | Minimum          
Short-term Debt          
Basis spread on variable rate (percentage)   1.60%      
France SAS | 2015 Senior Facilities Agreement | EURIBOR | Maximum          
Short-term Debt          
Basis spread on variable rate (percentage)   2.70%      
France SAS | Revolving Credit Facility | 2015 Senior Facilities Agreement | EURIBOR | Minimum          
Short-term Debt          
Basis spread on variable rate (percentage)   1.45%      
France SAS | Revolving Credit Facility | 2015 Senior Facilities Agreement | EURIBOR | Maximum          
Short-term Debt          
Basis spread on variable rate (percentage)   2.55%      
Flaga          
Short-term Debt          
Total capacity | €   € 55,000,000 € 55,000,000    
Flaga | Flaga Credit Facility Agreement | Overdraft Facility          
Short-term Debt          
Total capacity | €   5,000,000      
Flaga | Flaga Credit Facility Agreement | Guarantee Facility          
Short-term Debt          
Total capacity | €   25,000,000      
Flaga | Revolving Credit Facility | Flaga Credit Facility Agreement | Line of Credit          
Short-term Debt          
Total capacity | €   € 25,000,000      
Facility fee (percentage)   30.00%      
Flaga | Revolving Credit Facility | Flaga Credit Facility Agreement | EURIBOR | Minimum | Line of Credit          
Short-term Debt          
Basis spread on variable rate (percentage)   1.45%      
Flaga | Revolving Credit Facility | Flaga Credit Facility Agreement | EURIBOR | Maximum | Line of Credit          
Short-term Debt          
Basis spread on variable rate (percentage)   3.65%      
Energy Services          
Short-term Debt          
Total capacity       $ 240,000,000 240,000,000
Energy Services | Energy Services Credit Agreement          
Short-term Debt          
Maximum ratio of Total Indebtedness to EBITDA, after dividend payment   3.00   3.00  
Energy Services | Energy Services Credit Agreement | Minimum | Line of Credit          
Short-term Debt          
Basis spread on variable rate (percentage)   0.75%      
Energy Services | Energy Services Credit Agreement | Maximum | Line of Credit          
Short-term Debt          
Basis spread on variable rate (percentage)   2.25%      
Energy Services | Energy Services Credit Agreement | LIBOR | Line of Credit          
Short-term Debt          
Basis spread on variable rate (percentage)   1.00%      
Energy Services | Energy Services Credit Agreement | Federal Funds Rate | Line of Credit          
Short-term Debt          
Basis spread on variable rate (percentage)   0.50%      
Energy Services | Letter of Credit | Energy Services Credit Agreement | Line of Credit          
Short-term Debt          
Total capacity       $ 50,000,000  
UGI Utilities          
Short-term Debt          
Total capacity       450,000,000 $ 300,000,000
UGI Utilities | Letter of Credit | 2015 UGI Utilities Credit Agreement          
Short-term Debt          
Total capacity       $ 100,000,000  
UGI Utilities | Line of Credit | 2015 UGI Utilities Credit Agreement | LIBOR | Minimum          
Short-term Debt          
Basis spread on variable rate (percentage)   0.00%      
UGI Utilities | Line of Credit | 2015 UGI Utilities Credit Agreement | LIBOR | Maximum          
Short-term Debt          
Basis spread on variable rate (percentage)   1.75%