Employee Retirement Plans (Tables)

12 Months Ended

Sep. 30, 2011

Employee Retirement Plans [Abstract]

Change in Pension Benefits and Other postretirement benefits Obligations, plan assets, and the funded status

	Pension						Other Postretirement
	Benefits						Benefits
	2011			2010			2011			2010
Change in benefit obligations:
Benefit obligations — beginning of year	$	471.8		$	428.9		$	22.9		$	21.4
Service cost		8.8			8.7			0.4			0.4
Interest cost		24.1			23.5			1.1			1.1
Actuarial (gain) loss		(22.0	)		32.2			(2.4	)		1.6
Plan amendments		—			—			(0.1	)		—
Plan settlements		—			(2.7	)		—			—
Foreign currency		(0.1	)		(0.5	)		—			(0.2	)
Benefits paid		(19.7	)		(18.3	)		(1.4	)		(1.4	)
Benefit obligations — end of year	$	462.9		$	471.8		$	20.5		$	22.9
Change in plan assets:
Fair value of plan assets — beginning of year	$	287.9		$	279.8		$	10.0		$	9.7
Actual gain on plan assets		2.6			25.9			0.1			0.7
Foreign currency		—			(0.2	)		—			—
Employer contributions		19.2			3.4			1.1			1.0
Settlement payments		—			(2.7	)		—			—
Benefits paid		(19.7	)		(18.3	)		(1.4	)		(1.4	)
Fair value of plan assets — end of year	$	290.0		$	287.9		$	9.8		$	10.0
Funded status of the plans — end of year	$	(172.9	)	$	(183.9	)	$	(10.7	)	$	(12.9	)
(Liabilities) recorded in the balance sheet:
Unfunded liabilities — included in other current liabilities	$	(27.6	)	$	(20.3	)	$	—		$	—
Unfunded liabilities — included in other noncurrent liabilities		(145.3	)		(163.6	)		(10.7	)		(12.9	)
Net amount recognized	$	(172.9	)	$	(183.9	)	$	(10.7	)	$	(12.9	)
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax):
Prior service (credit) cost	$	(0.2	)	$	(0.4	)	$	(0.1	)	$	0.1
Net actuarial loss (gain)		13.6			13.8			(0.8	)		0.1
Total	$	13.4		$	13.4		$	(0.9	)	$	0.2
Amounts recorded in regulatory assets and liabilities (pre-tax):
Prior service cost (credit)	$	1.8		$	0.3		$	(3.2	)	$	(3.4	)
Net actuarial loss		146.9			155.6			6.3			5.9
Total	$	148.7		$	155.9		$	3.1		$	2.5

Actuarial assumptions for our domestic plans

	Pension Plans												Other Postretirement Benefits
	2011(a)			2010			2009			2008			2011			2010			2009			2008
Weighted-average assumptions:
Discount rate		5.3	%		5.0	%		5.5	%		6.8	%		5.3	%		5.0	%		5.5	%		6.8	%
Expected return on plan assets		8.0	%		8.5	%		8.5	%		8.5	%		5.5	%		5.5	%		5.5	%		5.5	%
Rate of increase in salary levels		3.5	%		3.8	%		3.8	%		3.8	%		3.5	%		3.8	%		3.8	%		3.8	%

(a) The discount rate used during Fiscal 2011 to calculate pension expense was a rate of 5.0% through December 31, 2010 (the date of the Utilities Plan Merger) and 5.5% for the remainder of Fiscal 2011.

Component of net periodic pension expense and other postretirement benefit costs

	Pension Benefits									Other Postretirement Benefits
	2011			2010			2009			2011			2010			2009
Service cost	$	8.8		$	8.7		$	7.1		$	0.4		$	0.4		$	0.3
Interest cost		24.1			23.5			23.3			1.1			1.1			1.2
Expected return on assets		(25.8	)		(25.8	)		(25.7	)		(0.5	)		(0.5	)		(0.6	)
Curtailment gain		—			—			—			(3.2	)		—			—
Settlement loss		—			1.0			1.8			—			—			—
Amortization of:
Transition obligation		—			—			—			—			—			0.2
Prior service cost (benefit)		0.2			—			—			(0.7	)		(0.4	)		(0.4	)
Actuarial loss (gain)		7.5			5.9			3.8			0.4			0.1			(0.1	)
Net benefit cost (income)		14.8			13.3			10.3			(2.5	)		0.7			0.6
Change in associated regulatory liabilities		—			—			—			3.1			3.1			3.3
Net benefit cost after change in regulatory liabilities	$	14.8		$	13.3		$	10.3		$	0.6		$	3.8		$	3.9

Expected payments for pension benefits and other postretirement welfare benefits

			Other
	Pension		Postretirement
	Benefits		Benefits
Fiscal 2012	$	20.7	$	2.0
Fiscal 2013		21.7		2.0
Fiscal 2014		23.0		2.0
Fiscal 2015		24.3		2.0
Fiscal 2016		26.0		2.0
Fiscal 2017 - 2021		148.5		9.9

Pension Plans

U.S. Pension Plans

							Target
	Actual						Asset			Permitted
	2011			2010			Allocation			Range
Equity investments:
Domestic		49.4	%		56.1	%		52.5	%		40.0% - 65.0	%
International		10.7	%		12.2	%		12.5	%		7.5% - 17.5	%
Total		60.1	%		68.3	%		65.0	%		60.0% - 70.0	%
Fixed income funds & cash equivalents		39.9	%		31.7	%		35.0	%		30.0% - 40.0	%
Total		100.0	%		100.0	%		100.0	%

VEBA

							Target
	Actual						Asset			Permitted
	2011			2010			Allocation			Range
Domestic equity investments		62.2	%		65.0	%		65.0	%		60.0% - 70.0	%
Fixed income funds & cash equivalents		37.8	%		35.0	%		35.0	%		30.0% - 40.0	%
Total		100.0	%		100.0	%		100.0	%

Fair value of U.S. pension plan and VEBA trust assets

	Pension Plans
	Quoted Prices
	in Active		Significant
	Markets for		Other
	Identical Assets		Observable		Unobservable
	and Liabilities		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
September 30, 2011:
Equity investments:
Domestic	$	143.1	$	—	$	—	$	143.1
International		31.0		—		—		31.0
Fixed income		113.6		—		—		113.6
Cash equivalents		—		2.0		—		2.0
Total	$	287.7	$	2.0	$	—	$	289.7
September 30, 2010:
Equity investments:
Domestic	$	161.5	$	—	$	—	$	161.5
International		35.2		—		—		35.2
Fixed income		88.9		—		—		88.9
Cash equivalents		—		2.3		—		2.3
Total	$	285.6	$	2.3	$	—	$	287.9

	VEBA
	Quoted Prices
	in Active		Significant
	Markets for		Other
	Identical Assets		Observable		Unobservable
	and Liabilities		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
September 30, 2011:
Domestic equity	$	6.1	$	—	$	—	$	6.1
Fixed income		3.3		—		—		3.3
Cash equivalents		—		0.4		—		0.4
Total	$	9.4	$	0.4	$	—	$	9.8
September 30, 2010:
Domestic equity	$	6.5	$	—	$	—	$	6.5
Fixed income		3.0		—		—		3.0
Cash equivalents		—		0.5		—		0.5
Total	$	9.5	$	0.5	$	—	$	10.0