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Investments Investments - Debt Service and Fixed Charge Coverage Ratios (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | $ 211.5 | $ 163.6
Commercial mortgage loans | 147.5 | 97.1
Delinquent amount of loans at end of period | 64.0 | 65.8
Commercial mortgage loans | Nonperforming loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 0.7
Commercial mortgage loans | Less than 50 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 14.9
Commercial mortgage loans | 50 to 60 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 131.2 | 39.3
Commercial mortgage loans | 61 to 70 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 80.3 | 99.5
Commercial mortgage loans | 71 to 80 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 9.9
Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 65.4 | 112.1
Middle market loans | Less than 50 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 11.0 | 59.8
Middle market loans | 50 to 60 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 9.2 | 11.0
Middle market loans | 61 to 70 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 15.8 | 6.4
Middle market loans | 71 to 80 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 5.6 | 0.0
Middle market loans | 80 to 100 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 12.0 | 17.2
Greater than 1.20x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 66.3 | 82.2
Greater than 1.20x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 25.8 | 73.6
1.00 - 1.20x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 62.4 | 14.9
1.00 - 1.20x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 22.8 | 0.0
Less than 1.00x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 18.8 | 0.0
Less than 1.00x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | $ 16.8 | $ 38.5

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- Definition This is the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e)(4) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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