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Investments Investments - Loan-to-Value Ratios (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Middle market loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | $ 112.1 | $ 111.7
Middle market loans | Less than 50 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 59.8 | 90.6
Middle market loans | 50 to 60 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 11.0 | 21.1
Middle market loans | 61 to 70 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 6.4 | 0.0
Middle market loans | 80 to 100 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 17.2 | 0.0
Middle market loans | Greater than 100% |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 17.7 | 0.0
Commercial mortgage loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 163.6 | 156.6
Commercial mortgage loans | Less than 50 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 14.9 | 0.0
Commercial mortgage loans | 50 to 60 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 39.3 | 80.5
Commercial mortgage loans | 61 to 70 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | 99.5 | 35.5
Commercial mortgage loans | 71 to 80 Percent |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Fair market value, trading | $ 9.9 | $ 40.6

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