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Employee Retirement Plans - Fair Value of U.S. Pension Plan and VEBA Trust Assets (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 529.2 | $ 493.7 | $ 453.8
Pension Benefits | U.S. Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 498.0 | 463.4 |
Other | 5.3 | 17.8 |
Pension Benefits | U.S. Pension Plan | Domestic equity investments: |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 274.9 | 250.5 |
Other | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 171.6 | 158.9 |
Other | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Small and midcap equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 65.2 | 43.2 |
Other | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Smallcap common stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 11.4 |
Other |  | 0.0 |
Pension Benefits | U.S. Pension Plan | UGI Corporation Common Stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 38.1 | 37.0 |
Other | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | International index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 61.6 | 47.3 |
Other | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Fixed income investments: |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 161.5 | 165.6 |
Other | 5.3 | 17.8 |
Pension Benefits | U.S. Pension Plan | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 156.2 | 147.8 |
Other | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 5.3 | 17.8 |
Other | 5.3 | 17.8 |
Pension Benefits | U.S. Pension Plan | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 492.7 | 445.6 |
Pension Benefits | U.S. Pension Plan | Level 1 | Domestic equity investments: |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 274.9 | 250.5 |
Pension Benefits | U.S. Pension Plan | Level 1 | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 171.6 | 158.9 |
Pension Benefits | U.S. Pension Plan | Level 1 | Small and midcap equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 65.2 | 43.2 |
Pension Benefits | U.S. Pension Plan | Level 1 | Smallcap common stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 11.4 |
Pension Benefits | U.S. Pension Plan | Level 1 | UGI Corporation Common Stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 38.1 | 37.0 |
Pension Benefits | U.S. Pension Plan | Level 1 | International index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 61.6 | 47.3 |
Pension Benefits | U.S. Pension Plan | Level 1 | Fixed income investments: |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 156.2 | 147.8 |
Pension Benefits | U.S. Pension Plan | Level 1 | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 156.2 | 147.8 |
Pension Benefits | U.S. Pension Plan | Level 1 | Cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 2 | Domestic equity investments: |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 2 | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 2 | Small and midcap equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 2 | Smallcap common stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 2 | UGI Corporation Common Stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 2 | International index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 2 | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | Domestic equity investments: |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | Small and midcap equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | Smallcap common stocks |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | UGI Corporation Common Stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | International index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | Fixed income investments: |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Benefits | U.S. Pension Plan | Level 3 | Cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
VEBA |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 14.8 | 13.7 |
Other | 0.4 | 0.1 |
VEBA | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 9.3 | 9.6 |
Other | 0.0 | 0.0 |
VEBA | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 5.1 | 4.0 |
Other | 0.0 | 0.0 |
VEBA | Cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.4 | 0.1 |
Other | 0.4 | 0.1 |
VEBA | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 14.4 | 13.6 |
VEBA | Level 1 | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 9.3 | 9.6 |
VEBA | Level 1 | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 5.1 | 4.0 |
VEBA | Level 1 | Cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
VEBA | Level 2 | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
VEBA | Level 2 | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
VEBA | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
VEBA | Level 3 | S&P 500 Index equity mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
VEBA | Level 3 | Bond index mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
VEBA | Level 3 | Cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 0.0 | $ 0.0 |

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