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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                
Loss on extinguishments of debt     $ 0 $ 4,400,000 $ 0 $ 59,700,000    
Amerigas Propane | Senior Notes | 7.00% Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate       7.00%   7.00%    
Flaga | Term Loan | Flaga Term Loan Due September 2018                
Debt Instrument [Line Items]                
Repayment of debt   $ 9,200,000            
Line of credit               $ 59,100,000
Flaga | Term Loan | Flaga Term Loan Due September 2020                
Debt Instrument [Line Items]                
Line of credit               49,900,000
UGI Utilities | Unsecured Debt                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 125,000,000              
Periodic payment, principal $ 1,600,000              
Minimum | UGI Utilities | Unsecured Debt                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.00%              
Maximum | UGI Utilities | Unsecured Debt                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.875%              
Revolving Credit Facility | Line of Credit | AmeriGas Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity               600,000,000
Revolving Credit Facility | Line of Credit | UGI International Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €             € 300,000,000  
Required ratio of total indebtedness to EBITDA   3.50            
Letter of Credit | Line of Credit | AmeriGas Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity               $ 150,000,000
Federal Funds Rate | AmeriGas Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.50%            
Base Rate | Minimum | AmeriGas Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.50%            
Base Rate | Maximum | AmeriGas Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.75%            
Eurodollar | Minimum | AmeriGas Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.50%            
Eurodollar | Maximum | AmeriGas Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.75%            
EURIBOR | Revolving Credit Facility | Minimum | Line of Credit | UGI International Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.45%            
EURIBOR | Revolving Credit Facility | Maximum | Line of Credit | UGI International Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.35%            
London Interbank Offered Rate (LIBOR) | Minimum | Flaga | Term Loan | Flaga Term Loan Due September 2018                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.125%            
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Minimum | Line of Credit | UGI International Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.70%            
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Maximum | Line of Credit | UGI International Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.60%