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Investments Investments - Debt Service and Fixed Charge Coverage Ratios (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	$ 295.0	$ 312.1
Commercial mortgage loans	295.0	292.2
Delinquent amount of loans at end of period	0.0	19.9
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	47.5	41.1
Commercial mortgage loans | 50 to 60 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	227.3	248.3
Commercial mortgage loans | 61 to 70 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	20.2	22.7
Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	102.1	106.9
Middle market loans | Less than 50 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	63.5	63.5
Middle market loans | 50 to 60 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	23.3	16.4
Middle market loans | 61 to 70 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	15.3	27.0
Greater than 1.20x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	112.3	106.1
Greater than 1.20x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	78.9	95.2
1.00 - 1.20x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	182.7	186.1
1.00 - 1.20x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	3.8	3.8
Less than 1.00x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	0.0	0.0
Less than 1.00x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	$ 19.4	$ 7.9

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CML less non-performing or future construction

+ References

No definition available.

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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
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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 https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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