Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 54.9	$ 51.3
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	300,000	300,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
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	434,200,000	438,800,000
Treasury stock, shares	204,500,000	199,900,000
Allowance for doubtful accounts, long-term	$ 0.4	$ 0.5