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Derivative Instruments and Hedging Activities - Narrative (Details)
€ in Millions
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Oct. 25, 2018
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Derivative              
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months $ 3,500,000            
Cash collateral pledged 29,300,000     $ 0      
Cash collateral received 0     12,200,000      
Restricted cash 63,700,000     9,600,000   $ 10,300,000 $ 15,600,000
IRPA              
Derivative              
Notional amount $ 0     0      
Foreign Exchange Forward              
Derivative              
Potential exposure coverage, percent 90.00% 90.00%          
Foreign currency contracts              
Derivative              
Notional amount $ 516,000,000.0     $ 512,200,000      
Foreign currency contracts | Net Investment Hedging              
Derivative              
Notional amount $ 0 € 172.8     € 0.0    
Senior Notes | UGI International LLC | 3.25% Senior Unsecured Notes Due November 2025              
Derivative              
Stated interest rate     3.25%