Revenue - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) obligation	Mar. 31, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Indemnity's 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 | $	$ 12.7	$ 13.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, satisfaction period	4 years