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Equity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Nov. 14, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-cash stock-based compensation expense	$ 14	$ 9	$ 27	$ 18
Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share repurchase authorized, amount					$ 100
Class A Common Stock | Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share repurchase authorized, amount					$ 100
Additional Paid-in Capital
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-cash stock-based compensation expense			$ 7	$ 15
Common Stock | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares issued under the plan (in shares)			1,738,018	1,738,000
Shares issued under omnibus incentive plan (in shares)	730,903	171,000	794,789	178,000

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