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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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+ References

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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

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