Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.9	$ 3.3
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	154,500,000	154,500,000
Common stock, shares outstanding	120,000,000	119,500,000
Treasury stock, shares	34,500,000	35,000,000