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DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - DEFERRED ACQUISITION COSTS (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | $ 2,025.4 | $ 1,851.3
Capitalizations | 212.5 | 187.7
Amortization expense | (116.7) | (104.3)
End of period | 2,121.2 | 1,934.7
Fixed indexed annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 450.0 | 407.6
Capitalizations | 54.6 | 46.6
Amortization expense | (31.5) | (26.9)
End of period | 473.1 | 427.3
Fixed interest annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 35.9 | 27.0
Capitalizations | 6.6 | 5.9
Amortization expense | (3.2) | (2.3)
End of period | 39.3 | 30.6
Supplemental health |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 438.1 | 408.0
Capitalizations | 35.4 | 30.5
Amortization expense | (18.6) | (17.0)
End of period | 454.9 | 421.5
Medicare supplement |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 157.4 | 157.5
Capitalizations | 14.6 | 12.7
Amortization expense | (12.5) | (13.3)
End of period | 159.5 | 156.9
Long-term care |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 148.6 | 140.3
Capitalizations | 14.6 | 10.5
Amortization expense | (7.7) | (7.3)
End of period | 155.5 | 143.5
Interest-sensitive life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 256.0 | 234.5
Capitalizations | 18.1 | 18.8
Amortization expense | (8.3) | (7.6)
End of period | 265.8 | 245.7
Traditional life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 529.5 | 471.9
Capitalizations | 68.6 | 59.6
Amortization expense | (33.3) | (29.0)
End of period | 564.8 | 502.5
Funding agreements |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 9.9 | 4.5
Capitalizations | 0.0 | 3.1
Amortization expense | (1.6) | (0.9)
End of period | $ 8.3 | $ 6.7

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