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Derivative Instruments and Hedging Activities - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
agreement
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
agreement
Jun. 30, 2020
USD ($)
Jun. 09, 2021
USD ($)
Jun. 08, 2021
USD ($)
May 03, 2021
USD ($)
Sep. 30, 2020
USD ($)
Derivative [Line Items]                
AOCI, Net Investment Hedge, Gain (Loss), Reclassification, before Tax $ (8,000,000) $ (13,000,000) $ (9,000,000) $ (22,000,000)        
Term Loan | 2021 UGI Corporation Senior Credit Facility                
Derivative [Line Items]                
Maximum borrowing capacity         $ 215,000,000 $ 300,000,000 $ 300,000,000  
Forward Starting, Pay-fixed, Receive-variable Interest Rate Swap Agreement                
Derivative [Line Items]                
Number of receive-variable interest rate swap agreements | agreement 2   2          
Forward Starting, Pay-fixed, Receive-variable Interest Rate Swap Agreement | Derivatives designated as hedging instruments:                
Derivative [Line Items]                
Notional amount $ 125,000,000   $ 125,000,000          
Variable interest rate 0.0069   0.0069          
IRPAs                
Derivative [Line Items]                
Notional amount $ 0 $ 0 $ 0 $ 0       $ 0
Pre-tax net losses associated with interest rate hedges $ 4,000,000   $ 4,000,000          
Forward Foreign Currency Exchange Contracts                
Derivative [Line Items]                
Derivative notional amount percent of required need coverage 90.00%   90.00%