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DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - DEFERRED ACQUISITION COSTS (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | $ 2,025.4 | $ 1,851.3
Capitalizations | 330.1 | 286.4
Amortization expense | (176.8) | (159.3)
End of period | 2,178.7 | 1,978.4
Fixed indexed annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 450.0 | 407.6
Capitalizations | 81.7 | 72.7
Amortization expense | (47.8) | (41.7)
End of period | 483.9 | 438.6
Fixed interest annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 35.9 | 27.0
Capitalizations | 9.1 | 9.4
Amortization expense | (4.8) | (3.6)
End of period | 40.2 | 32.8
Supplemental health |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 438.1 | 408.0
Capitalizations | 53.7 | 47.2
Amortization expense | (27.9) | (25.7)
End of period | 463.9 | 429.5
Medicare supplement |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 157.4 | 157.5
Capitalizations | 21.7 | 19.3
Amortization expense | (18.6) | (19.9)
End of period | 160.5 | 156.9
Long-term care |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 148.6 | 140.3
Capitalizations | 22.6 | 16.2
Amortization expense | (11.7) | (11.0)
End of period | 159.5 | 145.5
Interest-sensitive life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 256.0 | 234.5
Capitalizations | 28.1 | 28.0
Amortization expense | (12.5) | (11.6)
End of period | 271.6 | 250.9
Traditional life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 529.5 | 471.9
Capitalizations | 111.4 | 88.1
Amortization expense | (51.1) | (44.3)
End of period | 589.8 | 515.7
Funding agreements |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 9.9 | 4.5
Capitalizations | 1.8 | 5.5
Amortization expense | (2.4) | (1.5)
End of period | $ 9.3 | $ 8.5

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