Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 53.2	$ 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)	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
Common stock, shares outstanding (in shares)	407.7	408.1
Treasury stock, shares (in shares)	231.0	230.6
Short-term marketable securities under reverse repurchase agreements	$ 578.6	$ 384.0
Long-term marketable securities under reverse repurchase agreements	98.8
Cash and cash equivalents under reverse repurchase agreements	$ 1.7	$ 1.4