Income Taxes - Reconciliation of U.S. Federal Statutory Rate to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Provision for taxes at U.S. statutory rate	$ 1,023.2	$ 931.9	$ 798.9
State taxes, net of federal tax benefit	120.6	111.2	91.8
Foreign rate differential	41.0	33.1	41.3
Excess tax benefit - Stock-based compensation	(17.1)	(19.0)	(19.9)
Other	(47.4)	(31.6)	(56.9)
Total provision for income taxes	$ 1,120.3	$ 1,025.6	$ 855.2
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	2.50%	2.50%	2.40%
Foreign rate differential	0.90%	0.70%	1.10%
Excess tax benefit - Stock-based compensation	(0.40%)	(0.40%)	(0.50%)
Other	(1.00%)	(0.70%)	(1.50%)
Provision for income taxes from continuing operations, percent	23.00%	23.10%	22.50%