Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 12.1	$ 16.5	$ 27.0	$ (7.5)
Other comprehensive income (loss):
Change in unrealized holding gains (losses) on investments in securities, net	1.1	1.4	3.3	(1.8)
Other comprehensive income (loss) before taxes	1.1	1.4	3.3	(1.8)
Change in income tax (expense) benefit	(0.4)	(0.5)	(1.4)	0.9
Other comprehensive income (loss), net of taxes	0.7	0.9	1.9	(0.9)
Comprehensive income (loss)	12.8	17.4	28.9	(8.4)
Net loss (income) attributable to non-controlling interests	0.1	(0.8)	(0.9)	1.5
Comprehensive income (loss) attributable to Vanguard Health Systems, Inc. stockholders	$ 12.9	$ 16.6	$ 28.0	$ (6.9)