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Investments Investments - Debt Service and Fixed Charge Coverage Ratios (Details) $ in Millions	Dec. 31, 2019 USD ($)
Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	$ 156.6
Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	111.7
Greater than 1.20x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	94.6
Greater than 1.20x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	68.4
1.00 - 1.20x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	48.3
1.00 - 1.20x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	25.5
Less than 1.00x | Commercial mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	13.7
Less than 1.00x | Middle market loans
Loans and Leases Receivable Disclosure [Line Items]
Fair market value, trading	$ 17.8

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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=6876686&loc=d3e534808-122878

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