Investment Securities - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026 USD ($) investmentPosition	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) investmentPosition	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Investments, Debt and Equity Securities [Abstract]
Accrued investment interest	$ 38.3		$ 38.3		$ 36.3
Proceeds from sale of available-for-sale securities	$ 4.9	$ 48.0	$ 56.2	$ 120.6
Debt securities, unrealized loss position, number of positions \| investmentPosition	1,466		1,466
Unrealized gain (losses) on equity securities	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Equity securities without readily determinable fair value, amount	$ 102.8		$ 102.8		$ 76.6

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

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