Fair Value of Financial Instruments - Narrative (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of invested assets in total investment portfolio	7.90%
Net investment gains (losses) included in net income related to financial assets	$ 0.3	$ 5.8
Net investment gains (losses) included in net income related to financial liabilities	$ (1.2)	$ (1.9)