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Deposit Asset on Reinsurance - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Effects of Reinsurance [Line Items] |  |  |
Reinsurance block of in-force fixed and variable annuity business | $ 3,100.0 |  |
Minimum crediting rating (percent) | 4.50% |  |
Percentage of forced fixed annuities (percent) | 50.00% |  |
Fixed annuity reserves reinsured on a coinsurance basis | $ 2,500.0 |  |
Net investment income | 400.9 | $ 422.5 | $ 357.6
Separate account asset | 2,792.3 | 3,441.0 |
Separate account liability | 2,792.3 | 3,441.0 |
Reinsurance Contract Modified Coinsurance Basis |  |  |
Effects of Reinsurance [Line Items] |  |  |
Separate account asset | 600.0 |  |
Separate account liability | 600.0 |  |
Deposit Asset On Reinsurance |  |  |
Effects of Reinsurance [Line Items] |  |  |
Net investment income | $ 103.5 | $ 101.1 | $ 97.3

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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 + Details
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