Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data	Jun. 30, 2011	Jun. 30, 2010
Consolidated Balance Sheets
Allowance for doubtful accounts	$ 2.0	$ 2.0
Preferred stock, shares Authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares Authorized	650,000,000	650,000,000
Common stock, shares issued	149,600,000	145,900,000
Common stock, shares outstanding	123,700,000	129,200,000
Treasury stock, shares	25,900,000	16,700,000