Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Jun. 30, 2023
Debt Instrument [Line Items]
Notes payable	$ 3,004.5	$ 3,004.9
Less: current portion	(1.1)	(1.2)
Less: unamortized discount and debt issuance costs	(13.2)	(14.7)
Long-term debt	$ 2,990.2	2,989.0
Fixed-rate 3.375% notes due September 15, 2025
Debt Instrument [Line Items]
Stated interest rate	3.375%
Debt instrument effective rate (percent)	3.47%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 1.700% notes due May 15, 2028
Debt Instrument [Line Items]
Stated interest rate	1.70%
Debt instrument effective rate (percent)	1.85%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 1.250% notes due September 1, 2030
Debt Instrument [Line Items]
Stated interest rate	1.25%
Debt instrument effective rate (percent)	1.83%
Notes payable	$ 1,000.0	1,000.0
Other
Debt Instrument [Line Items]
Notes payable	$ 4.5	$ 4.9