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Employee Retirement Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 U.S Pension Plans | Sep. 30, 2013 U.S Pension Plans | Sep. 30, 2012 U.S Pension Plans | Sep. 30, 2014 Supplemental Employee Retirement Plans | Sep. 30, 2013 Supplemental Employee Retirement Plans | Sep. 30, 2013 Portion Used to Fund Company Established Trusts Supplemental Employee Retirement Plans | Sep. 30, 2015 Forecast | Sep. 30, 2014 Other Assets Supplemental Employee Retirement Plans | Sep. 30, 2013 Other Assets Supplemental Employee Retirement Plans | Sep. 30, 2014 Supplemental defined contribution executive retirement plans [Member] Other Assets | Sep. 30, 2013 Supplemental defined contribution executive retirement plans [Member] Other Assets
Defined Benefit Plan Disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial losses |  |  |  |  |  |  |  |  |  | $ 10.3 |  |  |  |
Amortization of prior service credits |  |  |  |  |  |  |  |  |  | 0.2 |  |  |  |
ABO for the Pension Plans |  |  |  | 499.1 | 451.3 |  |  |  |  |  |  |  |  |
Contribution made to Pension Plan |  |  |  | 19.2 | 22.4 | 31.2 |  |  |  |  |  |  |  |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 38.4 | 33.9 |  |  |  |  |  |  |  |  |  |  |  |
Net cost to sponsor unfunded and non-qualified supplemental executive retirement plans | 2.6 | 3.0 | 3.0 |  |  |  |  |  |  |  |  |  |  |
Amounts recorded in UGI's stockholders include pre-tax losses representing unrecognized actuarial losses | (10.2) | (9.4) |  |  |  |  |  |  |  |  |  |  |  |
Amount of expected amortization of pre-tax actuarial losses into retiree benefit cost |  |  |  |  |  |  |  |  |  | 0.9 |  |  |  |
Pension and Other Postretirement Benefit Contributions |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Pension and Other Postretirement Benefit Contributions, Fair Value |  |  |  | 442.4 | 398.2 |  |  |  |  |  | 26.6 | 23.7 | 3.4 | 3.4
Percentage of aggregate employer securities holdings to not to exceed fair value assets | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock represented pension plan assets | 9.60% | 8.20% |  |  |  |  |  |  |  |  |  |  |  |
Costs of benefits under savings plans | $ 14.7 | $ 14.0 | $ 13.7 |  |  |  |  |  |  |  |  |  |  |

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- Definition Defined benefit plan future amortization of actuarial gains losses. + References No definition available. + Details
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- Definition Net costs for unfunded and non-qualified supplemental executive retirement plans. + References No definition available. + Details
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- Definition Percentage of aggregate employer securities holdings to not to exceed fair value assets. + References No definition available. + Details
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- Definition Net costs for unfunded and non qualified supplemental executive retirement plans. + References No definition available. + Details
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- Definition Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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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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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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