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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax
Balance, beginning of period	$ 4,100.0
Other comprehensive income (loss) before reclassification adjustments (after-tax)	(17.1)	$ 21.9
Amounts reclassified from AOCI:
Reclassification adjustments (pre-tax)	1.4	0.1
Reclassification adjustments tax (benefit) expense	(0.4)	(0.1)
Reclassification adjustments (after-tax)	1.0	0.0
Other comprehensive income (loss) attributable to UGI	(16.1)	21.9
Reclassification of stranded income tax effects related to TCJA	(6.6)
Balance, end of period	4,046.6	4,082.1
Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax
Balance, beginning of period	(11.0)	(19.2)
Other comprehensive income (loss) before reclassification adjustments (after-tax)	0.0	0.0
Amounts reclassified from AOCI:
Reclassification adjustments (pre-tax)	0.4	0.6
Reclassification adjustments tax (benefit) expense	(0.1)	(0.2)
Reclassification adjustments (after-tax)	0.3	0.4
Other comprehensive income (loss) attributable to UGI	0.3	0.4
Reclassification of stranded income tax effects related to TCJA	(2.9)
Balance, end of period	(13.6)	(18.8)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax
Balance, beginning of period	(16.1)	(21.4)
Other comprehensive income (loss) before reclassification adjustments (after-tax)	(1.5)	(0.4)
Amounts reclassified from AOCI:
Reclassification adjustments (pre-tax)	1.0	(0.5)
Reclassification adjustments tax (benefit) expense	(0.3)	0.1
Reclassification adjustments (after-tax)	0.7	(0.4)
Other comprehensive income (loss) attributable to UGI	(0.8)	(0.8)
Reclassification of stranded income tax effects related to TCJA	(3.7)
Balance, end of period	(20.6)	(22.2)
Foreign Currency
AOCI Attributable to Parent, Net of Tax
Balance, beginning of period	(83.3)	(52.8)
Other comprehensive income (loss) before reclassification adjustments (after-tax)	(15.6)	22.3
Amounts reclassified from AOCI:
Reclassification adjustments (pre-tax)	0.0	0.0
Reclassification adjustments tax (benefit) expense	0.0	0.0
Reclassification adjustments (after-tax)	0.0	0.0
Other comprehensive income (loss) attributable to UGI	(15.6)	22.3
Reclassification of stranded income tax effects related to TCJA	0.0
Balance, end of period	(98.9)	(30.5)
Total
AOCI Attributable to Parent, Net of Tax
Balance, beginning of period	(110.4)	(93.4)
Amounts reclassified from AOCI:
Balance, end of period	$ (133.1)	$ (71.5)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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