Restatements of Condensed Consolidated Financial Statements - Condensed Consolidated Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013
Assets:
Deferred income taxes	$ 9.1		$ 10.6	$ 6.6
Property, plant and equipment	4,543.4		4,480.2	4,323.7
Liabilities and equity:
Other current liabilities	609.3		627.5	552.9
Deferred income taxes	986.2		962.3	933.5
Other noncurrent liabilities	514.7		527.2	616.9
Retained earnings	1,566.7		1,308.3	1,354.9
Accumulated other comprehensive loss	25.4	24.3	8.4	(27.4)
Noncontrolling interests, principally in AmeriGas Partners	1,109.8		1,055.4	1,133.9
As Previously Reported
Assets:
Deferred income taxes				27.3
Property, plant and equipment				4,325.0
Liabilities and equity:
Deferred income taxes				956.9
Other noncurrent liabilities				613.5
Retained earnings				1,361.9
Accumulated other comprehensive loss				(30.7)
Noncontrolling interests, principally in AmeriGas Partners				1,132.2
Adjustment
Assets:
Deferred income taxes				(20.7)
Property, plant and equipment				(1.3)
Liabilities and equity:
Deferred income taxes				(23.4)
Other noncurrent liabilities				3.4
Retained earnings				(7.0)
Accumulated other comprehensive loss				3.3
Noncontrolling interests, principally in AmeriGas Partners				$ 1.7