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Segregated Funds - Segregated Fund Types (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Percent of fixed income funds invested in diversified equities or high-yield bonds 25.00%  
Bottom of range | Money market    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 1.00% 1.00%
Bottom of range | Fixed income    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 10.00% 10.00%
Bottom of range | Balanced    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 40.00% 40.00%
Bottom of range | Equity    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 40.00% 40.00%
Top of range | Money market    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 5.00% 5.00%
Top of range | Fixed income    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 15.00% 15.00%
Top of range | Balanced    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 45.00% 45.00%
Top of range | Equity    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Type of funds by percentage of total investments 45.00% 45.00%