SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Collateral Pledged | Derivative
Junior subordinated debt owed to unconsolidated trusts
Restricted cash and cash equivalents	$ 14.4
Third-Party Service Provider
Junior subordinated debt owed to unconsolidated trusts
Restricted cash and cash equivalents	13.6
Federal Reserve Bank
Junior subordinated debt owed to unconsolidated trusts
Restricted cash	$ 68.1	$ 43.9