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Employee Retirement Plans - Fair Value of U.S. Pension Plan and VEBA Trust Assets (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
U.S Pension Plans
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 463.4	$ 430.8
U.S Pension Plans | Domestic equity investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	250.5	242.0
U.S Pension Plans | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	158.9	147.3
U.S Pension Plans | Small and Midcap Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	43.2	40.6
U.S Pension Plans | Smallcap Common Stocks
Defined Benefit Plan Disclosure
Fair value of plan assets	11.4	10.7
U.S Pension Plans | UGI Corporation Common Stock
Defined Benefit Plan Disclosure
Fair value of plan assets	37.0	43.4
U.S Pension Plans | International Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	47.3	43.9
U.S Pension Plans | Fixed income investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	165.6	144.9
U.S Pension Plans | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	147.8	140.8
U.S Pension Plans | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	17.8	4.1
VEBA Trust
Defined Benefit Plan Disclosure
Fair value of plan assets	13.7	12.5
VEBA Trust | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	9.6	8.4
VEBA Trust | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	4.0	3.8
VEBA Trust | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	0.1	0.3
Level 1 | U.S Pension Plans
Defined Benefit Plan Disclosure
Fair value of plan assets	445.6	426.7
Level 1 | U.S Pension Plans | Domestic equity investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	250.5	242.0
Level 1 | U.S Pension Plans | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	158.9	147.3
Level 1 | U.S Pension Plans | Small and Midcap Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	43.2	40.6
Level 1 | U.S Pension Plans | Smallcap Common Stocks
Defined Benefit Plan Disclosure
Fair value of plan assets	11.4	10.7
Level 1 | U.S Pension Plans | UGI Corporation Common Stock
Defined Benefit Plan Disclosure
Fair value of plan assets	37.0	43.4
Level 1 | U.S Pension Plans | International Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	47.3	43.9
Level 1 | U.S Pension Plans | Fixed income investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	147.8	140.8
Level 1 | U.S Pension Plans | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	147.8	140.8
Level 1 | U.S Pension Plans | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 1 | VEBA Trust
Defined Benefit Plan Disclosure
Fair value of plan assets	13.6	12.2
Level 1 | VEBA Trust | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	9.6	8.4
Level 1 | VEBA Trust | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	4.0	3.8
Level 1 | VEBA Trust | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans
Defined Benefit Plan Disclosure
Fair value of plan assets	17.8	4.1
Level 2 | U.S Pension Plans | Domestic equity investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans | Small and Midcap Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans | Smallcap Common Stocks
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans | UGI Corporation Common Stock
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans | International Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans | Fixed income investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	17.8	4.1
Level 2 | U.S Pension Plans | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | U.S Pension Plans | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	17.8	4.1
Level 2 | VEBA Trust
Defined Benefit Plan Disclosure
Fair value of plan assets	0.1	0.3
Level 2 | VEBA Trust | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | VEBA Trust | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 2 | VEBA Trust | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	0.1	0.3
Level 3 | U.S Pension Plans
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | Domestic equity investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | Small and Midcap Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | Smallcap Common Stocks
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | UGI Corporation Common Stock
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | International Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | Fixed income investments:
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | U.S Pension Plans | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | VEBA Trust
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | VEBA Trust | S&P 500 Index Equity Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | VEBA Trust | Bond Index Mutual Funds
Defined Benefit Plan Disclosure
Fair value of plan assets	0.0	0.0
Level 3 | VEBA Trust | Cash Equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 0.0	$ 0.0

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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

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