Fair Value Measurements - Fair Value Inputs, Quantitative Information (Details) - Fair Value Measured on a Non-recurring Basis $ in Millions	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Significant Unobservable Inputs (Level 3) | Carrying Amount
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral-dependent loans	$ 137.5	$ 97.6
Collateral-dependent loans | Estimated Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral-dependent loans	26.9	97.6
Collateral-dependent loans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral-dependent loans	0.0	0.0
Collateral-dependent loans | Significant Other Observable Inputs (Level 2)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral-dependent loans	0.0	0.0
Collateral-dependent loans | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral-dependent loans	$ 26.9	$ 97.6
Collateral-dependent loans | Discount Rate | Significant Unobservable Inputs (Level 3) | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0.15	0
Collateral-dependent loans | Discount Rate | Significant Unobservable Inputs (Level 3) | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	1	0.87
Collateral-dependent loans | Discount Rate | Significant Unobservable Inputs (Level 3) | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	(0.29)	(0.40)