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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | $ 330.6 |  |  |
Amortization expense | $ (25.4) | $ (21.5) | (49.1) | $ (43.5) |  |
Balance, end of period | 332.9 |  | 332.9 |  | $ 330.6 |
Previously Reported |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | 433.1 |  |  |
Amortization expense |  | (27.0) |  | (53.4) |  |
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 |  | $ 5.5 |  | 9.9 |  |
Balance, end of period |  |  |  |  | (102.5) |
Whole Life |  |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 21.2 |  | 20.9 | 19.1 | 19.1 | $ 17.8
Capitalizations | 0.7 |  | 1.3 |  | 3.0 | 2.4
Amortization expense | (0.3) |  | (0.6) |  | (1.2) | (1.1)
Experience adjustment | 0.0 |  | 0.0 |  | 0.0 | 0.0
Balance, end of period | 21.6 |  | 21.6 |  | 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 | 30.7 |  | 30.0 | 27.5 | 27.5 | 25.6
Capitalizations | 1.5 |  | 2.8 |  | 5.0 | 4.2
Amortization expense | (0.8) |  | (1.4) |  | (2.5) | (2.3)
Experience adjustment | 0.0 |  | 0.0 |  | 0.0 | 0.0
Balance, end of period | 31.4 |  | 31.4 |  | 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 |  | 5.8 | 6.0 | 6.0 | 6.2
Capitalizations | 0.1 |  | 0.1 |  | 0.2 | 0.2
Amortization expense | (0.2) |  | (0.2) |  | (0.4) | (0.4)
Experience adjustment | 0.0 |  | 0.0 |  | 0.0 | 0.0
Balance, end of period | 5.7 |  | 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 | 6.8 |  | 6.7 | 5.6 | 5.6 | 4.4
Capitalizations | 0.3 |  | 0.5 |  | 1.4 | 1.5
Amortization expense | (0.1) |  | (0.2) |  | (0.3) | (0.3)
Experience adjustment | 0.0 |  | 0.0 |  | 0.0 | 0.0
Balance, end of period | 7.0 |  | 7.0 |  | 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 | 15.7 |  | 15.4 | 13.7 | 13.7 | 12.9
Capitalizations | 0.7 |  | 1.2 |  | 2.5 | 1.7
Amortization expense | (0.3) |  | (0.5) |  | (0.8) | (0.8)
Experience adjustment | 0.0 |  | 0.0 |  | 0.0 | (0.1)
Balance, end of period | 16.1 |  | 16.1 |  | 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 | 6.7 |  | 6.2 | 4.9 | 4.9 | 4.3
Capitalizations | 0.7 |  | 1.3 |  | 1.8 | 1.1
Amortization expense | (0.2) |  | (0.3) |  | (0.5) | (0.5)
Experience adjustment | (0.2) |  | (0.2) |  | 0.0 | 0.0
Balance, end of period | 7.0 |  | 7.0 |  | 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 | 219.7 |  | 221.1 | $ 223.3 | 223.3 | 223.1
Capitalizations | 3.7 |  | 7.7 |  | 15.5 | 17.3
Amortization expense | (3.7) |  | (7.4) |  | (15.8) | (16.0)
Experience adjustment | (2.5) |  | (4.2) |  | (1.9) | (1.1)
Balance, end of period | $ 217.2 |  | $ 217.2 |  | $ 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

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