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Investments Investments - Debt Service and Fixed Charge Coverage Ratios (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | $ 163.6 | $ 156.6
Delinquent amount of loans at end of period | 65.8 | 48.4
Commercial mortgage loans | Nonperforming loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.7 |
Commercial mortgage loans | Less than 50 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 14.9 | 0.0
Commercial mortgage loans | 50 to 60 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 39.3 | 80.5
Commercial mortgage loans | 61 to 70 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 99.5 | 35.5
Commercial mortgage loans | 71 to 80 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 9.9 | 40.6
Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 112.1 | 111.7
Middle market loans | Less than 50 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 59.8 | 90.6
Middle market loans | 50 to 60 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 11.0 | 21.1
Middle market loans | 61 to 70 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 6.4 | 0.0
Middle market loans | 80 to 100 Percent |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 17.2 | 0.0
Greater than 1.20x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 82.2 | 94.6
Greater than 1.20x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 73.6 | 68.4
1.00 - 1.20x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 14.9 | 0.0
1.00 - 1.20x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 25.5
Less than 1.00x | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 0.0 | 13.7
Less than 1.00x | Middle market loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | 38.5 | 17.8
Debt Service Coverage Ratio, excluding footnote values | Commercial mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Fair market value, trading | $ 97.1 | $ 108.3

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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=118948506&loc=d3e107314-111719 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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