CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2021	Jun. 30, 2021
Statement of Financial Position [Abstract]
Trade receivables, allowances	$ 37.9	$ 47.7
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)	100,000	1,000,000.0
Convertible Series B preferred stock, shares outstanding (in shares)	100,000	1,000,000.0
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000.0	20,000,000.0
Preferred stock, shares issued (in shares)	1,500,000	1,500,000
Preferred stock, shares outstanding (in shares)	1,500,000	1,500,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,250,000,000	1,250,000,000
Common stock, shares issued (in shares)	905,000,000.0	832,300,000
Common stock, shares outstanding (in shares)	838,700,000	766,000,000.0
Treasury stock, at cost, shares (in shares)	66,300,000	66,300,000