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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Oct. 25, 2018
Sep. 30, 2018
Derivative [Line Items]          
Potential exposure coverage, percent $ 3,500,000        
Pre-tax losses associated with net investment hedges 20,400,000 $ 6,100,000      
Derivative collateral, right to reclaim cash 8,900,000 10,000,000.0 $ 29,300,000    
Restricted cash 95,800,000 17,400,000 63,700,000   $ 9,600,000
Interest Rate Protection Agreements          
Derivative [Line Items]          
Notional amount $ 0 $ 0 $ 0    
Foreign Exchange Forward          
Derivative [Line Items]          
International local currency earnings before income taxes 90.00%        
UGI International LLC | 3.25% Senior Unsecured Notes Due November 2025 | Senior Notes          
Derivative [Line Items]          
Stated interest rate       3.25%