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Segregated Funds - Segregated Fund Types (Details) | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
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%

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