CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Statement of Financial Position [Abstract]
Trade receivables, allowances	$ 47.7	$ 57.3
Convertible Series B preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Convertible Series B preferred stock, shares authorized (in shares)	1,000,000.0	1,000,000.0
Convertible Series B preferred stock, shares issued (in shares)	1,000,000.0	800,000
Convertible Series B preferred stock, shares outstanding (in shares)	1,000,000.0	800,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	20,000,000.0	20,000,000.0
Preferred stock, shares issued (shares)	1,500,000	1,500,000
Preferred stock, shares outstanding (shares)	1,500,000	1,500,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	1,250,000,000	1,250,000,000
Common stock, shares issued (shares)	832,300,000	830,600,000
Common stock, shares outstanding (shares)	766,000,000.0	765,100,000
Treasury stock (shares)	66,300,000	65,500,000