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Investments Investments - Loan-to-Value Ratios (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Middle market loans
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	$ 65.4	$ 112.1
Middle market loans | Less than 50 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	11.0	59.8
Middle market loans | 50 to 60 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	9.2	11.0
Middle market loans | 61 to 70 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	15.8	6.4
Middle market loans | 71 to 80 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	5.6	0.0
Middle market loans | 80 to 100 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	12.0	17.2
Middle market loans | Greater than 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	11.8	17.7
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	211.5	163.6
Commercial mortgage loans | Less than 50 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	0.0	14.9
Commercial mortgage loans | 50 to 60 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	131.2	39.3
Commercial mortgage loans | 61 to 70 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	80.3	99.5
Commercial mortgage loans | 71 to 80 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
Fair market value, trading	$ 0.0	$ 9.9

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+ References

No definition available.

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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=120398452&loc=d3e534808-122878

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