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Investments Investments - Debt Service and Fixed Charge Coverage Ratios (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	$ 312.1	$ 211.5
Commercial mortgage loans	292.2	147.5
Delinquent amount of loans at end of period	19.9	64.0
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	41.1	0.0
Commercial mortgage loans | 50 to 60 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	248.3	131.2
Commercial mortgage loans | 61 to 70 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	22.7	80.3
Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	106.9	65.4
Middle market loans | Less than 50 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	63.5	11.0
Middle market loans | 50 to 60 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	16.4	9.2
Middle market loans | 61 to 70 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	27.0	15.8
Middle market loans | 71 to 80 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	0.0	5.6
Middle market loans | 80 to 100 Percent
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	0.0	12.0
Greater than 1.20x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	106.1	66.3
Greater than 1.20x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	95.2	25.8
1.00 - 1.20x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	186.1	62.4
1.00 - 1.20x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	3.8	22.8
Less than 1.00x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	0.0	18.8
Less than 1.00x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	$ 7.9	$ 16.8

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CML less non-performing or future construction

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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
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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).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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