Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 52.2	$ 53.0
Allowance for doubtful accounts, long-term	$ 0.1	$ 0.1
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized	300,000	300,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	638,700,000	638,700,000
Common stock, shares outstanding	408,100,000	412,100,000
Treasury stock, shares	230,600,000	226,600,000
Marketable securities under reverse repurchase agreements	$ 384.0	$ 104.6
Cash and cash equivalents under reverse repurchase agreements	$ 1.4	$ 0.8