Investment Securities - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2026 USD ($) investmentPosition	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Investments, Debt and Equity Securities [Abstract]
Accrued investment interest	$ 35.7		$ 36.3
Proceeds from sale of available-for-sale securities	$ 25.2	$ 47.6
Debt securities, unrealized loss position, number of positions \| investmentPosition	763
Unrealized gain (losses) on equity securities	$ 0.0	$ 0.0
Equity securities without readily determinable fair value, amount	$ 87.2		$ 76.6

Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of investment in equity security without readily determinable fair value.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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