Debt - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($) note	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) note	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Debt Instrument [Line Items]
Number of fixed rate notes issued | note	4		4
Debt instrument, face amount	$ 4,000.0		$ 4,000.0
Notional amount of derivatives terminated	1,000.0	$ 1,000.0
Unamortized loss on cash flow hedges	3.0	12.5	15.6	$ 0.0	$ 0.0
Long-term debt, fair value	3,801.5		$ 3,801.5
Derivative Instrument, Termination One
Debt Instrument [Line Items]
Notional amount of derivatives terminated	300.0	400.0
Derivative Instrument, Termination Two
Debt Instrument [Line Items]
Notional amount of derivatives terminated	100.0	600.0
Derivative Instrument, Termination Three
Debt Instrument [Line Items]
Notional amount of derivatives terminated	$ 600.0
Fixed-rate 4.450% notes due September 9, 2034 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000.0
Interest rate, stated percentage	4.45%	4.45%	4.45%
Fixed-rate 4.750% notes due May 8, 2032 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,000.0		$ 1,000.0
Interest rate, stated percentage	4.75%		4.75%
Fixed-rate 3.375% notes due September 15, 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.375%		3.375%
Redeemed amount	$ 1,000.0		$ 1,000.0
Minimum
Debt Instrument [Line Items]
Debt instrument, term			7 years
Maximum
Debt Instrument [Line Items]
Debt instrument, term			10 years