Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Jun. 30, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts - trade receivables - Current	$ 35.1	$ 35.5
Allowance for doubtful accounts - trade receivables - Long-term	$ 0.7	$ 0.6
Preferred stock, par value	$ 1	$ 1.00
Preferred stock, shares authorized	300,000.0	300,000.0
Preferred stock, shares issued	0	0
Common stock, par value (usd per share)	$ 0.10	$ 0.10
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	638,700,000	638,700,000
Common stock, shares outstanding	458,700,000	466,400,000
Treasury stock, shares	180,100,000	172,300,000