Debt - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Dec. 31, 2024 USD ($) note	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) note	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Number of fixed rate notes issued | note	4			4
Debt face amount	$ 4,000.0			$ 4,000.0
Notional amount of derivatives terminated		$ 1,000.0
Unamortized loss on cash flow hedges	0.0	12.5	$ 0.0	12.5	$ 0.0
Fair value of notes issued	$ 3,688.6			$ 3,688.6
Derivative Instrument, Termination One
Debt Instrument [Line Items]
Notional amount of derivatives terminated		400.0
Derivative Instrument, Termination Two
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 face amount		$ 1,000.0
Stated interest rate	4.45%	4.45%		4.45%
Minimum
Debt Instrument [Line Items]
Debt instrument, term				7 years
Maximum
Debt Instrument [Line Items]
Debt instrument, term				10 years