Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. Federal Statutory Tax Rate	$ 1,203.4	$ 1,115.1	$ 1,023.2
Tax Jurisdiction of Domicile [Extensible Enumeration]	United States
State and local income taxes, net of federal income tax effect	$ 151.0	128.0	120.6
Foreign tax effects	82.8	39.0	41.0
Effect of cross-border tax laws	(50.7)
Tax credits	(43.5)
Nontaxable or nondeductible items	2.0
Changes in unrecognized tax benefits	(12.7)
Other	(15.5)
Total provision for income taxes	$ 1,316.8	$ 1,230.4	$ 1,120.3
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal Statutory Tax Rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax effect	2.60%	2.40%	2.50%
Foreign tax effects	1.50%	0.70%	0.90%
Effect of cross-border tax laws	(0.90%)
Tax credits	(0.70%)
Nontaxable or nondeductible items	0.00%
Changes in unrecognized tax benefits	(0.20%)
Other	(0.30%)	(0.50%)	(1.00%)
Effective tax rate	23.00%	23.20%	23.00%