Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Jun. 30, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts - trade receivables - Current	$ 78.2	$ 79.6
Allowance for doubtful accounts - trade receivables - Long-term	$ 0.2	$ 0.3
Preferred stock, par value (in US$ per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	300,000	300,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in US$ per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	638,700,000	638,700,000
Common stock, shares outstanding (in shares)	420,400,000	423,700,000
Treasury stock, (in shares)	218,300,000	215,000,000.0