Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Oct. 31, 2016	Sep. 30, 2016	Jun. 30, 2016
Debt Instrument
Total long-term debt	$ 4,165.3		$ 4,172.1
Less: current maturities	(18.8)		(177.5)
Total long-term debt due after one year	4,146.5		3,994.6
AmeriGas Propane
Debt Instrument
Unamortized debt issuance costs	(27.5)		(31.3)
Total long-term debt	2,569.6		2,572.3
AmeriGas Propane \| Other
Debt Instrument
Long-term debt, gross	14.6		17.3
AmeriGas Propane \| Senior Notes \| 5.50% due May 2025
Debt Instrument
Long-term debt, gross	$ 700.0		700.0
Stated interest rate	5.50%
AmeriGas Propane \| Senior Notes \| 5.875% due August 2026
Debt Instrument
Long-term debt, gross	$ 675.0		675.0
Stated interest rate	5.875%
AmeriGas Propane \| Senior Notes \| 5.625% due May 2024
Debt Instrument
Long-term debt, gross	$ 675.0		675.0
Stated interest rate	5.625%
AmeriGas Propane \| Senior Notes \| 5.75% due May 2027
Debt Instrument
Long-term debt, gross	$ 525.0		525.0
Stated interest rate	5.75%
AmeriGas Propane \| Senior Secured Notes \| HOLP Senior Secured Notes
Debt Instrument
Long-term debt, gross	$ 7.5		11.3
UGI International
Debt Instrument
Unamortized debt issuance costs	(2.5)		(4.6)
Total long-term debt	748.5		838.8
UGI International \| Other \| Other
Debt Instrument
Long-term debt, gross	20.9		21.3
France SAS \| Term Loan \| France SAS Senior Facilities term loan, due through April 2020
Debt Instrument
Long-term debt, gross	627.0		708.9
Flaga \| Term Loan \| Flaga variable-rate term loan, due October 2020
Debt Instrument
Long-term debt, gross	53.2		54.1
Flaga \| Term Loan \| Flaga U.S. dollar variable-rate term loan, due September 2018
Debt Instrument
Long-term debt, gross	49.9	$ 59.1	59.1
UGI Utilities
Debt Instrument
Unamortized debt issuance costs	(4.1)		(3.9)
Total long-term debt	838.0		751.1
UGI Utilities \| Senior Notes \| 4.12%, due September 2046
Debt Instrument
Long-term debt, gross	$ 200.0		200.0
Stated interest rate	4.12%				4.12%
UGI Utilities \| Senior Notes \| 4.98%, due March 2044
Debt Instrument
Long-term debt, gross	$ 175.0		175.0
Stated interest rate	4.98%
UGI Utilities \| Senior Notes \| 4.12%, due October 2046
Debt Instrument
Long-term debt, gross	$ 100.0		100.0
Stated interest rate	4.12%			4.12%
UGI Utilities \| Senior Notes \| 6.21%, due September 2036
Debt Instrument
Long-term debt, gross	$ 100.0		100.0
Stated interest rate	6.21%
UGI Utilities \| Senior Notes \| 2.95%, due June 2026
Debt Instrument
Long-term debt, gross	$ 100.0		100.0
Stated interest rate	2.95%					2.95%
UGI Utilities \| Other \| Other
Debt Instrument
Long-term debt, gross	$ 6.8		0.0
UGI Utilities \| Term Loan \| Variable-rate
Debt Instrument
Long-term debt, gross	120.3		0.0
UGI Utilities \| Medium-term Notes \| 6.13%, due October 2034
Debt Instrument
Long-term debt, gross	$ 20.0		20.0
Stated interest rate	6.13%
UGI Utilities \| Medium-term Notes \| 6.50%, due August 2033
Debt Instrument
Long-term debt, gross	$ 20.0		20.0
Stated interest rate	6.50%
UGI Utilities \| Medium-term Notes \| 5.67%, due January 2018
Debt Instrument
Long-term debt, gross	$ 0.0		20.0
Stated interest rate	5.67%
UGI Utilities \| Medium-term Notes \| 7.25%, due November 2017
Debt Instrument
Long-term debt, gross	$ 0.0		20.0
Stated interest rate	7.25%
Other
Debt Instrument
Total long-term debt	$ 9.2		$ 9.9