Revenue - Narrative (Details) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2021
USD ($)
obligation
|
Dec. 31, 2020
USD ($)
|
Dec. 31, 2019
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 | ||
Indemnity revenue recognized | $ | $ 36.9 | $ 35.9 | $ 33.9 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | |||
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |||
Period of time over which indemnity revenue will be recognized | 4 years |