General form of registration statement for all companies including face-amount certificate companies

Significant Accounting Policies - Shared Risk Revenue (Details)

v3.21.4
Significant Accounting Policies - Shared Risk Revenue (Details) - Shared Risk Revenue
9 Months Ended 12 Months Ended
Sep. 30, 2021
contract
Dec. 31, 2020
item
Disaggregation of Revenue [Line Items]    
Percentage of shared risk savings received 30.00% 30.00%
Number of separate arrangements 4 4
Percentage of total cost savings to be received, if the sequential YoY PMPY aggregate change yields a reduction 30.00% 30.00%