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Fair Value of Financial Instruments - Information about Significant Unobservable Inputs used in Fair Value Measurement (Details) - Level III $ in Millions	Dec. 31, 2025 USD ($) basis_points
Financial instruments and other inventory positions sold, but not yet purchased | Interest rate locks | Discounted cash flow | Premium over the MMD curve | Minimum
Fair Value Inputs Assets and Liabilities Quantitative Information
Derivative liability contracts, measurement input	0
Financial instruments and other inventory positions sold, but not yet purchased | Interest rate locks | Discounted cash flow | Premium over the MMD curve | Maximum
Fair Value Inputs Assets and Liabilities Quantitative Information
Derivative liability contracts, measurement input	46
Financial instruments and other inventory positions sold, but not yet purchased | Interest rate locks | Discounted cash flow | Premium over the MMD curve | Weighted Average
Fair Value Inputs Assets and Liabilities Quantitative Information
Derivative liability contracts, measurement input	11.8
Financial instruments and other inventory positions owned | Interest rate locks | Discounted cash flow | Premium over the MMD curve | Minimum
Fair Value Inputs Assets and Liabilities Quantitative Information
Derivative asset contracts, measurement input	0
Financial instruments and other inventory positions owned | Interest rate locks | Discounted cash flow | Premium over the MMD curve | Maximum
Fair Value Inputs Assets and Liabilities Quantitative Information
Derivative asset contracts, measurement input	26
Financial instruments and other inventory positions owned | Interest rate locks | Discounted cash flow | Premium over the MMD curve | Weighted Average
Fair Value Inputs Assets and Liabilities Quantitative Information
Derivative asset contracts, measurement input	8.0
Investments
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value | $	$ 218.0
Investments | Measurement Input, Recent Round of Independent Financing
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value | $	$ 54.4
Investments | Discounted cash flow | Discount rate | Minimum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	0.15
Investments | Discounted cash flow | Discount rate | Maximum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	0.25
Investments | Discounted cash flow | Discount rate | Weighted Average
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	0.213
Investments | Market approach | Revenue multiple | Minimum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	2
Investments | Market approach | Revenue multiple | Maximum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	10
Investments | Market approach | Revenue multiple | Weighted Average
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	6.7
Investments | Market approach | EBITDA multiple | Minimum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	11
Investments | Market approach | EBITDA multiple | Maximum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	19
Investments | Market approach | EBITDA multiple | Weighted Average
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	14.5
Investments | Market approach | Equity value as multiple of independent financing value | Minimum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	1
Investments | Market approach | Equity value as multiple of independent financing value | Maximum
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	3
Investments | Market approach | Equity value as multiple of independent financing value | Weighted Average
Fair Value Inputs Assets and Liabilities Quantitative Information
Investments at fair value, measurement input	2.0

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Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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