Employee Benefit Plans - Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 266.1	$ 243.5	$ 220.4
Income tax benefit	66.0	60.2	54.5
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	36.0	30.0	24.6
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	193.7	179.5	165.0
Research and development
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 36.4	$ 34.0	$ 30.8