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Investments Investments - Debt Service and Fixed Charge Coverage Ratios (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | $ 312.1 | $ 211.5
Commercial mortgage loans | 292.2 | 147.5
Delinquent amount of loans at end of period | 19.9 | 64.0
Commercial mortgage loans | Nonperforming loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 0.0
Commercial mortgage loans | Less than 50 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 41.1 | 0.0
Commercial mortgage loans | 50 to 60 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 248.3 | 131.2
Commercial mortgage loans | 61 to 70 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 22.7 | 80.3
Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 106.9 | 65.4
Middle market loans | Less than 50 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 63.5 | 11.0
Middle market loans | 50 to 60 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 16.4 | 9.2
Middle market loans | 61 to 70 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 27.0 | 15.8
Middle market loans | 71 to 80 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 5.6
Middle market loans | 80 to 100 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 12.0
Greater than 1.20x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 106.1 | 66.3
Greater than 1.20x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 95.2 | 25.8
1.00 - 1.20x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 186.1 | 62.4
1.00 - 1.20x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 3.8 | 22.8
Less than 1.00x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 18.8
Less than 1.00x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | $ 7.9 | $ 16.8

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