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Accumulated Other Comprehensive Income - Schedule of Accumulated Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year	$ 3,572.4	$ 3,663.2
Other comprehensive (loss) income before reclassification adjustments (after-tax)	(34.2)	(98.5)	$ 5.8
Amounts reclassified from AOCI and noncontrolling interests:
Reclassification adjustments (pre-tax)	(10.5)	6.6	(45.6)
Reclassification adjustments tax expense	4.6	(3.6)	1.4
Reclassification adjustments (after-tax)	(5.9)	3.0	(44.2)
Other comprehensive income (loss)	(40.1)	(95.5)	(38.4)
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners		2.1	8.8
Other comprehensive income (loss) attributable to UGI	(40.1)	(93.4)	(29.6)
Balance, end of year	3,601.8	3,572.4	3,663.2
Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year	(20.4)	(20.6)	(16.4)
Other comprehensive (loss) income before reclassification adjustments (after-tax)	(10.9)	(1.2)	(5.2)
Amounts reclassified from AOCI and noncontrolling interests:
Reclassification adjustments (pre-tax)	2.6	2.2	1.6
Reclassification adjustments tax expense	(0.4)	(0.8)	(0.6)
Reclassification adjustments (after-tax)	2.2	1.4	1.0
Other comprehensive income (loss)		0.2	(4.2)
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners		0.0	0.0
Other comprehensive income (loss) attributable to UGI	(8.7)	0.2	(4.2)
Balance, end of year	(29.1)	(20.4)	(20.6)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year	11.2	(9.3)	(26.9)
Other comprehensive (loss) income before reclassification adjustments (after-tax)	(16.5)	16.8	54.0
Amounts reclassified from AOCI and noncontrolling interests:
Reclassification adjustments (pre-tax)	(13.1)	4.4	(47.2)
Reclassification adjustments tax expense	5.0	(2.8)	2.0
Reclassification adjustments (after-tax)	(8.1)	1.6	(45.2)
Other comprehensive income (loss)		18.4	8.8
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners		2.1	8.8
Other comprehensive income (loss) attributable to UGI	(24.6)	20.5	17.6
Balance, end of year	(13.4)	11.2	(9.3)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year	(105.4)	8.7	51.7
Other comprehensive (loss) income before reclassification adjustments (after-tax)	(6.8)	(114.1)	(43.0)
Amounts reclassified from AOCI and noncontrolling interests:
Reclassification adjustments (pre-tax)	0.0	0.0	0.0
Reclassification adjustments tax expense	0.0	0.0	0.0
Reclassification adjustments (after-tax)	0.0	0.0	0.0
Other comprehensive income (loss)		(114.1)	(43.0)
Add comprehensive loss attributable to noncontrolling interests, principally in AmeriGas Partners		0.0	0.0
Other comprehensive income (loss) attributable to UGI	(6.8)	(114.1)	(43.0)
Balance, end of year	(112.2)	(105.4)	8.7
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of year	(114.6)	(21.2)	8.4
Amounts reclassified from AOCI and noncontrolling interests:
Balance, end of year	$ (154.7)	$ (114.6)	$ (21.2)

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