Loans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs	$ 48.3		$ 48.3		$ 46.3
Accrued interest receivable	50.1		50.1		45.7
Interest income on nonaccrual loans	$ 0.1	$ 0.1	1.9	$ 2.3
Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Remaining fair value adjustment for loans acquired			$ (120.8)		$ (150.0)
Percentage of fair value adjustment for loans acquired	(3.90%)		(3.90%)		(4.00%)