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Long-Duration Insurance Contracts - Deferred Policy Acquisition Costs, Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | $ 336.3 |
Amortization expense | (27.0) | $ (23.7)
Balance, end of period | 337.3 |
Whole Life Insurance |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | 22.3 | 20.9
Capitalizations | 0.7 | 0.6
Amortization expense | (0.3) | (0.3)
Experience adjustment | (0.1) | 0.0
Balance, end of period | 22.6 | 21.2
Term Life Insurance |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | 32.6 | 30.0
Capitalizations | 1.2 | 1.3
Amortization expense | (0.9) | (0.6)
Experience adjustment | 0.0 | 0.0
Balance, end of period | 32.9 | 30.7
Experience Life Insurance |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | 5.7 | 5.8
Capitalizations | 0.1 | 0.0
Amortization expense | (0.1) | 0.0
Experience adjustment | 0.0 | 0.0
Balance, end of period | 5.7 | 5.8
Limited Pay Whole Life Insurance |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | 7.4 | 6.7
Capitalizations | 0.2 | 0.2
Amortization expense | (0.1) | (0.1)
Experience adjustment | 0.0 | 0.0
Balance, end of period | 7.5 | 6.8
Indexed Universal Life Insurance |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | 16.8 | 15.4
Capitalizations | 0.7 | 0.5
Amortization expense | (0.3) | (0.2)
Experience adjustment | (0.1) | 0.0
Balance, end of period | 17.1 | 15.7
Supplemental health |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | 8.2 | 6.2
Capitalizations | 0.8 | 0.6
Amortization expense | (0.2) | (0.1)
Experience adjustment | (0.1) | 0.0
Balance, end of period | 8.7 | 6.7
Total Annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Balance, beginning of period | 214.0 | 221.1
Capitalizations | 3.9 | 4.0
Amortization expense | (3.7) | (3.7)
Experience adjustment | (1.3) | (1.7)
Balance, end of period | $ 212.9 | $ 219.7

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