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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | [1] | $ 330.6 |  |  |  |
Amortization expense |  | (101.2) | $ (88.2) | [2] | $ (90.6) | [2]
Balance, end of period |  | 336.3 | 330.6 | [1] |  |
Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 433.1 |  |  |  |
Amortization expense |  |  | (98.7) |  | (94.7) |
Balance, end of period |  |  | 433.1 |  |  |
Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | (102.5) |  |  |  |
Amortization expense |  |  | 10.5 |  | 4.1 |
Balance, end of period |  |  | (102.5) |  |  |
Whole Life |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 20.9 | 19.1 |  | 17.8 |
Capitalizations |  | 2.7 | 3.0 |  | 2.4 |
Amortization expense |  | (1.2) | (1.2) |  | (1.1) |
Experience adjustment |  | (0.1) | 0.0 |  | 0.0 |
Balance, end of period |  | 22.3 | 20.9 |  | 19.1 |
Whole Life | Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 17.8 |
Whole Life | Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0.0 |
Term Life |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 30.0 | 27.5 |  | 25.6 |
Capitalizations |  | 5.8 | 5.0 |  | 4.2 |
Amortization expense |  | (3.1) | (2.5) |  | (2.3) |
Experience adjustment |  | (0.1) | 0.0 |  | 0.0 |
Balance, end of period |  | 32.6 | 30.0 |  | 27.5 |
Term Life | Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 25.6 |
Term Life | Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0.0 |
Experience life |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 5.8 | 6.0 |  | 6.2 |
Capitalizations |  | 0.3 | 0.2 |  | 0.2 |
Amortization expense |  | (0.4) | (0.4) |  | (0.4) |
Experience adjustment |  | 0.0 | 0.0 |  | 0.0 |
Balance, end of period |  | 5.7 | 5.8 |  | 6.0 |
Experience life | Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 2.6 |
Experience life | Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 3.6 |
Limited-pay whole life |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 6.7 | 5.6 |  | 4.4 |
Capitalizations |  | 1.1 | 1.4 |  | 1.5 |
Amortization expense |  | (0.3) | (0.3) |  | (0.3) |
Experience adjustment |  | (0.1) | 0.0 |  | 0.0 |
Balance, end of period |  | 7.4 | 6.7 |  | 5.6 |
Limited-pay whole life | Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.4 |
Limited-pay whole life | Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0.0 |
Indexed Universal Life |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 15.4 | 13.7 |  | 12.9 |
Capitalizations |  | 2.5 | 2.5 |  | 1.7 |
Amortization expense |  | (1.0) | (0.8) |  | (0.8) |
Experience adjustment |  | (0.1) | 0.0 |  | (0.1) |
Balance, end of period |  | 16.8 | 15.4 |  | 13.7 |
Indexed Universal Life | Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 11.3 |
Indexed Universal Life | Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 1.6 |
Supplemental health |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 6.2 | 4.9 |  | 4.3 |
Capitalizations |  | 2.9 | 1.8 |  | 1.1 |
Amortization expense |  | (0.6) | (0.5) |  | (0.5) |
Experience adjustment |  | (0.3) | 0.0 |  | 0.0 |
Balance, end of period |  | 8.2 | 6.2 |  | 4.9 |
Supplemental health | Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.3 |
Supplemental health | Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0.0 |
Total Annuities |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  | 221.1 | 223.3 |  | 223.1 |
Capitalizations |  | 15.0 | 15.5 |  | 17.3 |
Amortization expense |  | (14.7) | (15.8) |  | (16.0) |
Experience adjustment |  | (7.4) | (1.9) |  | (1.1) |
Balance, end of period |  | $ 214.0 | $ 221.1 |  | 223.3 |
Total Annuities | Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 137.7 |
Total Annuities | Effect of the Adoption of ASU 2018-12 |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | $ 85.4 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements
[2] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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- Definition Amount of expense for writeoff from unexpected insurance contract termination, charged against previously capitalized deferred policy acquisition cost. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479432/944-30-50-2B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479401/944-30-55-2 + Details
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