Debt - Narrative (Details) $ in Millions	12 Months Ended
	Jun. 30, 2026 USD ($) note	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)
Debt Instrument [Line Items]
Number of fixed rate notes issued | note	5
Debt instrument, face amount	$ 5,000.0
Notional amount of derivatives terminated	1,000.0
Unamortized gain on cash flow hedges	3.7	$ (15.6)	$ 0.0
Long-term debt, fair value	4,803.0
Derivative Instrument, Termination One
Debt Instrument [Line Items]
Notional amount of derivatives terminated	300.0
Derivative Instrument, Termination Two
Debt Instrument [Line Items]
Notional amount of derivatives terminated	700.0
Fixed-rate 5.00% notes due May 7, 2036 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,000.0
Interest rate, stated percentage	5.00%
Minimum
Debt Instrument [Line Items]
Debt instrument, term	7 years
Maximum
Debt Instrument [Line Items]
Debt instrument, term	10 years