Employee Benefit Plans - Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 242.6	$ 266.1	$ 243.5
Income tax benefit	60.0	66.0	60.2
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]: us-gaap:OperatingCostsAndExpenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	32.9	36.0	30.0
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]: us-gaap:ResearchAndDevelopmentExpense
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	33.7	36.4	34.0
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 176.0	$ 193.7	$ 179.5