Medicare and Medicaid EHR Incentives (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Other Income [Abstract]
Net income (loss) attributable to Vanguard Health Systems, Inc. stockholders	$ 21.3	$ 44.0	$ 47.4	$ 38.0
Medicare and Medicaid EHR incentives	5.4	2.4	31.2	26.8
Receivables related to EHR incentives	1.7		1.7			2.7
Deferred revenue related to EHR incentives	$ 2.0		$ 2.0		$ 4.3