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Employee Retirement Plans - Fair Value of U.S. Pension Plan and VEBA Trust Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
VEBA Trust
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets $ 12.8 $ 11.7
VEBA Trust | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 8.7 7.7
VEBA Trust | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 3.7 3.8
VEBA Trust | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 0.4 0.2
U.S Pension Plans
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 442.4 398.2
U.S Pension Plans | Domestic Equity Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 245.8 228.9
U.S Pension Plans | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 152.6 141.8
U.S Pension Plans | Small and Midcap Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 41.4 54.5
U.S Pension Plans | Smallcap Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 9.3  
U.S Pension Plans | UGI Corporation Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 42.5 32.6
U.S Pension Plans | International Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 49.9 44.4
U.S Pension Plans | Fixed Income Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 146.7 124.9
U.S Pension Plans | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 141.0 120.9
U.S Pension Plans | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 5.7 4.0
Level 1 | VEBA Trust
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 12.4 11.5
Level 1 | VEBA Trust | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 8.7 7.7
Level 1 | VEBA Trust | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 3.7 3.8
Level 1 | VEBA Trust | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 1 | U.S Pension Plans
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 436.7 394.2
Level 1 | U.S Pension Plans | Domestic Equity Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 245.8 228.9
Level 1 | U.S Pension Plans | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 152.6 141.8
Level 1 | U.S Pension Plans | Small and Midcap Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 41.4 54.5
Level 1 | U.S Pension Plans | Smallcap Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 9.3  
Level 1 | U.S Pension Plans | UGI Corporation Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 42.5 32.6
Level 1 | U.S Pension Plans | International Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 49.9 44.4
Level 1 | U.S Pension Plans | Fixed Income Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 141.0 120.9
Level 1 | U.S Pension Plans | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 141.0 120.9
Level 1 | U.S Pension Plans | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | VEBA Trust
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 0.4 0.2
Level 2 | VEBA Trust | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | VEBA Trust | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | VEBA Trust | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 0.4 0.2
Level 2 | U.S Pension Plans
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 5.7 4.0
Level 2 | U.S Pension Plans | Domestic Equity Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | U.S Pension Plans | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | U.S Pension Plans | Small and Midcap Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | U.S Pension Plans | Smallcap Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets     
Level 2 | U.S Pension Plans | UGI Corporation Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | U.S Pension Plans | International Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | U.S Pension Plans | Fixed Income Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 5.7 4.0
Level 2 | U.S Pension Plans | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 2 | U.S Pension Plans | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets 5.7 4.0
Level 3 | VEBA Trust
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | VEBA Trust | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | VEBA Trust | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | VEBA Trust | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | Domestic Equity Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | S&P 500 Index Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | Small and Midcap Equity Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | Smallcap Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets     
Level 3 | U.S Pension Plans | UGI Corporation Common Stock
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | International Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | Fixed Income Investments
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | Bond Index Mutual Funds
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets      
Level 3 | U.S Pension Plans | Cash Equivalents
    
Fair Value of Pension Plan Assets    
Fair Value of Plan Assets