Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Debt Instrument [Line Items]
Notes payable	$ 5,001.8	$ 4,002.9
Less: current portion	(1.0)	(1.0)
Less: unamortized discount and debt issuance costs	(36.7)	(27.2)
Total long-term debt	$ 4,964.1	3,974.7
Fixed-rate 1.70% notes due May 15, 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.70%
Effective Interest Rate	1.85%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 1.25% notes due September 1, 2030 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.25%
Effective Interest Rate	1.83%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 4.75% notes due May 8, 2032 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Effective Interest Rate	4.95%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 4.45% notes due September 9, 2034 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.45%
Effective Interest Rate	4.75%
Notes payable	$ 1,000.0	1,000.0
Fixed-rate 5.00% notes due May 7, 2036 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.00%
Effective Interest Rate	5.14%
Notes payable	$ 1,000.0	0.0
Other
Debt Instrument [Line Items]
Notes payable	$ 1.8	$ 2.9