Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 92.5	$ 54.9
Preferred stock, par value (in dollars per share)	$ 1.00
Preferred stock, shares authorized	300,000
Preferred stock, shares issued	0
Common stock, par value (in dollars per share)	$ 0.10
Common stock, shares authorized	1,000,000,000.0
Common stock, shares issued	638,700,000
Common stock, shares outstanding	429,900,000	434,200,000
Treasury stock, shares	208,900,000	204,500,000
Allowance for doubtful accounts, long-term	$ 0.5	$ 0.4