Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Current assets:
Allowance for doubtful accounts	$ 382.1	$ 366.5
Vanguard Health Systems, Inc. stockholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	77,492,000	75,474,000
Common stock, shares outstanding	77,492,000	75,474,000