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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 |  |

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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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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