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Debt - Term Loan Facility (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
Debt - Term Loan Facility (Details) - USD ($) $ in Millions	Apr. 30, 2026	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Feb. 28, 2025
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ 0	$ (5)
Refinancing Term Loan B-2 Facility \| Secured Debt
Debt Instrument [Line Items]
Debt classified as short-term		45
Secured Debt \| Refinancing Term Loan B-2 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 700
Repayments of debt		$ 30		$ 115
Annual effective interest rate		5.42%
Secured Debt \| Refinancing Term Loan B-2 Facility \| Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 70
Secured Debt \| Refinancing Term Loan B-3 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 400
Annual effective interest rate		5.42%