Employee Retirement Plans (Details 5) (U.S Pension Plans [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	$ 398.2	$ 351.5
S&P 500 Index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	141.8	118.9
Small and midcap equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	54.5	42.9
UGI Corporation Common Stock
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	32.6	26.4
Total domestic equity investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	228.9	188.2
International index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	44.4	36.9
Bond index mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	120.9	123.3
Cash equivalents
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	4.0	3.1
Total fixed income investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	124.9	126.4
Fair Value, Inputs, Level 1 [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	394.2	348.4
Fair Value, Inputs, Level 1 [Member] | S&P 500 Index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	141.8	118.9
Fair Value, Inputs, Level 1 [Member] | Small and midcap equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	54.5	42.9
Fair Value, Inputs, Level 1 [Member] | UGI Corporation Common Stock
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	32.6	26.4
Fair Value, Inputs, Level 1 [Member] | Total domestic equity investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	228.9	188.2
Fair Value, Inputs, Level 1 [Member] | International index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	44.4	36.9
Fair Value, Inputs, Level 1 [Member] | Bond index mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	120.9	123.3
Fair Value, Inputs, Level 1 [Member] | Cash equivalents
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 1 [Member] | Total fixed income investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	120.9	123.3
Fair Value, Inputs, Level 2 [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	4.0	3.1
Fair Value, Inputs, Level 2 [Member] | S&P 500 Index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] | Small and midcap equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] | UGI Corporation Common Stock
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] | Total domestic equity investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] | International index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] | Bond index mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 2 [Member] | Cash equivalents
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	4.0	3.1
Fair Value, Inputs, Level 2 [Member] | Total fixed income investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets	4.0	3.1
Fair Value, Inputs, Level 3 [Member]
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | S&P 500 Index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Small and midcap equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | UGI Corporation Common Stock
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Total domestic equity investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | International index equity mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Bond index mutual funds
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Cash equivalents
Fair Value of Pension Plan Assets
Fair Value of Plan Assets
Fair Value, Inputs, Level 3 [Member] | Total fixed income investments
Fair Value of Pension Plan Assets
Fair Value of Plan Assets