Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Jun. 30, 2024
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 50.3	$ 52.2
Allowance for doubtful accounts, long-term	$ 0.2	$ 0.1
Preferred stock, par value (in USD 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 USD 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)	406,900,000	408,100,000
Treasury stock, shares (in shares)	231,800,000	230,600,000
Short-term marketable securities under reverse repurchase agreements		$ 384.0
Cash and cash equivalents under reverse repurchase agreements		$ 1.4