Revenue - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) obligation	Mar. 31, 2025 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Management fee rate as a percent of direct and affiliated assumed written premiums of the Exchange	25.00%
Performance obligations under subscriber's agreement | obligation	2
Revenue recognized that was included in the contract liability at beginning of year | $	$ 17.2	$ 15.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, satisfaction period	4 years