Loans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net deferred costs	$ 46.3		$ 46.3		$ 43.9
Accrued interest receivable	40.2		40.2		38.1
Interest income on nonaccrual loans	$ 0.1	$ 0.1	2.3	$ 1.1
Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Remaining fair value adjustment for loans acquired			$ (102.2)		$ 128.1
Percentage of fair value adjustment for loans acquired	3.90%		3.90%		4.30%