Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 46.0	$ 47.1
Preferred stock, par value (in dollars 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 dollars 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)	404,900,000	405,300,000
Treasury stock, shares (in shares)	233,800,000	233,400,000
Short-term marketable securities under reverse repurchase agreements	$ 247.4	$ 38.4