Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Debt Instrument [Line Items]
Notes payable	$ 4,002.6	$ 4,002.9
Less: current portion	(1.0)	(1.0)
Less: unamortized discount and debt issuance costs	(26.0)	(27.2)
Total long-term debt	$ 3,975.6	3,974.7
Fixed-rate 1.700% notes due May 15, 2028 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	1.70%
Debt instrument effective rate (in percent)	1.85%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 1.250% notes due September 1, 2030 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	1.25%
Debt instrument effective rate (in percent)	1.83%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 4.750% notes due May 8, 2032 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.75%
Debt instrument effective rate (in percent)	4.95%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 4.450% notes due September 9, 2034 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.45%
Debt instrument effective rate (in percent)	4.75%
Notes payable	$ 1,000.0	1,000.0
Other
Debt Instrument [Line Items]
Notes payable	$ 2.6	$ 2.9