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Schedule of Participating Mortgage Loans by Internal Credit Rating and Loan to Value (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 2,390.0 | $ 2,435.4
Mortgage Loans, Percent of Total | 100.00% | 100.00%
Loan to Value Ratio Below or Equal to 65 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 1,352.1 | $ 1,389.6
Mortgage Loans, Percent of Total | 56.60% | 57.00%
Loan To Value Ratio Above 65 To 75 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 917.8 | $ 937.2
Mortgage Loans, Percent of Total | 38.40% | 38.50%
Loan To Value Ratio Above 75 To 85 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 91.5 | $ 75.0
Mortgage Loans, Percent of Total | 3.80% | 3.10%
Loan To Value Ratio Above 85 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 28.6 | $ 33.6
Mortgage Loans, Percent of Total | 1.20% | 1.40%
AA Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 80.2 | $ 92.3
Mortgage Loans, Percent of Total | 3.40% | 3.80%
A Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 803.7 | $ 843.9
Mortgage Loans, Percent of Total | 33.60% | 34.60%
BBB Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 1,465.2 | $ 1,458.0
Mortgage Loans, Percent of Total | 61.30% | 59.90%
BB Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans, Carrying Amount | $ 40.9 | $ 41.2
Mortgage Loans, Percent of Total | 1.70% | 1.70%

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