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Fair Value - Visa Derivative (Details) - Visa derivative $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023	Dec. 31, 2018
Class B restricted shares
Fair value
Conversion rate			1.5875	1.6483
Class B-2 shares
Fair value
Conversion rate	1.5223
Class C Shares
Fair value
Conversion rate	4
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair value
Derivative liability	$ 2.3	$ 2.3

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