Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2011	Jun. 30, 2011
Condensed Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 2.2	$ 2.0
Preferred stock, shares authorized	25.0	25.0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	650.0	650.0
Common stock, shares issued	150.6	149.6
Common stock, shares outstanding	123.8	123.7
Treasury stock, shares	26.8	25.9