Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Current:
Federal	$ 847.4	$ 840.0	$ 620.7
Foreign	132.8	104.6	97.5
State	177.5	161.1	100.4
Total current	1,157.7	1,105.7	818.6
Deferred:
Federal	(18.7)	(77.4)	20.7
Foreign	(6.6)	4.3	(12.9)
State	(12.1)	(7.0)	28.8
Total deferred	(37.4)	(80.1)	36.6
Total provision for income taxes	$ 1,120.3	$ 1,025.6	$ 855.2