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Employee Retirement Plans - Fair Value of U.S. Pension Plan and VEBA Trust Assets (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
U.S Pension Plans |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | $ 430.8 | $ 442.4
U.S Pension Plans | Domestic equity investments: |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 242.0 | 245.8
U.S Pension Plans | S&P 500 Index Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 147.3 | 152.6
U.S Pension Plans | Small and Midcap Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 40.6 | 41.4
U.S Pension Plans | Smallcap Common Stocks |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 10.7 | 9.3
U.S Pension Plans | UGI Corporation Common Stock |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 43.4 | 42.5
U.S Pension Plans | International Index Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 43.9 | 49.9
U.S Pension Plans | Fixed income investments: |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 144.9 | 146.7
U.S Pension Plans | Bond Index Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 140.8 | 141.0
U.S Pension Plans | Cash Equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 4.1 | 5.7
VEBA Trust |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 12.5 | 12.8
VEBA Trust | S&P 500 Index Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 8.4 | 8.7
VEBA Trust | Bond Index Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 3.8 | 3.7
VEBA Trust | Cash Equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0.3 | 0.4
Level 1 | U.S Pension Plans |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 426.7 | 436.7
Level 1 | U.S Pension Plans | Domestic equity investments: |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 242.0 | 245.8
Level 1 | U.S Pension Plans | S&P 500 Index Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 147.3 | 152.6
Level 1 | U.S Pension Plans | Small and Midcap Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 40.6 | 41.4
Level 1 | U.S Pension Plans | Smallcap Common Stocks |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 10.7 | 9.3
Level 1 | U.S Pension Plans | UGI Corporation Common Stock |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 43.4 | 42.5
Level 1 | U.S Pension Plans | International Index Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 43.9 | 49.9
Level 1 | U.S Pension Plans | Fixed income investments: |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 140.8 | 141.0
Level 1 | U.S Pension Plans | Bond Index Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 140.8 | 141.0
Level 1 | VEBA Trust |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 12.2 | 12.4
Level 1 | VEBA Trust | S&P 500 Index Equity Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 8.4 | 8.7
Level 1 | VEBA Trust | Bond Index Mutual Funds |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 3.8 | 3.7
Level 2 | U.S Pension Plans |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 4.1 | 5.7
Level 2 | U.S Pension Plans | Fixed income investments: |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 4.1 | 5.7
Level 2 | U.S Pension Plans | Cash Equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 4.1 | 5.7
Level 2 | VEBA Trust |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | 0.3 | 0.4
Level 2 | VEBA Trust | Cash Equivalents |  |
Defined Benefit Plan Disclosure |  |
Fair value of plan assets | $ 0.3 | $ 0.4

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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