Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Current:
Federal	$ 785.4	$ 880.5	$ 847.4
Foreign	217.2	136.0	132.8
State	157.9	176.9	177.5
Total current	1,160.5	1,193.4	1,157.7
Deferred:
Federal	160.1	0.7	(18.7)
Foreign	(14.2)	19.4	(6.6)
State	10.4	16.9	(12.1)
Total deferred	156.3	37.0	(37.4)
Total provision for income taxes	$ 1,316.8	$ 1,230.4	$ 1,120.3