Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2023	Jun. 30, 2023
Statement of Financial Position [Abstract]
Allowance for doubtful accounts - trade receivables - current	$ 48.6	$ 53.0
Allowance for doubtful accounts - trade receivables - long-term	$ 0.1	$ 0.1
Preferred stock, par value (in USD per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	0.3	0.3
Preferred stock, shares issued (in shares)	0.0	0.0
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	1,000.0	1,000.0
Common stock, shares issued (in shares)	638.7	638.7
Common stock, shares outstanding (in shares)	410.7	412.1
Treasury stock, shares (in shares)	228.0	226.6
Short-term marketable securities under reverse repurchase agreements	$ 21.5
Cash and cash equivalents under reverse repurchase agreements	$ 0.1	$ 0.8
Long-term marketable securities under reverse repurchase agreements		$ 104.6