Income Taxes - Reconciliation of U.S. Federal Statutory Rate to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Provision for taxes at U.S. statutory rate	$ 1,115.1	$ 1,023.2	$ 931.9
State taxes, net of federal tax benefit	128.0	120.6	111.2
Foreign rate differential	39.0	41.0	33.1
Excess tax benefit - Stock-based compensation	(24.3)	(17.1)	(19.0)
Other	(27.4)	(47.4)	(31.6)
Total provision for income taxes	$ 1,230.4	$ 1,120.3	$ 1,025.6
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Provision for taxes at U.S. statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal tax benefit	2.40%	2.50%	2.50%
Foreign rate differential	0.70%	0.90%	0.70%
Excess tax benefit - Stock-based compensation	(0.40%)	(0.40%)	(0.40%)
Other	(0.50%)	(1.00%)	(0.70%)
Provision for income taxes from continuing operations, percent	23.20%	23.00%	23.10%