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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, 2024 | Sep. 30, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | $ 1,851.3 | $ 1,690.4
Capitalizations | 286.4 | 260.7
Amortization expense | (159.3) | (142.4)
End of period | 1,978.4 | 1,808.7
Fixed indexed annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 407.6 | 365.6
Capitalizations | 72.7 | 65.5
Amortization expense | (41.7) | (34.1)
End of period | 438.6 | 397.0
Fixed interest annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 27.0 | 19.6
Capitalizations | 9.4 | 8.0
Amortization expense | (3.6) | (2.8)
End of period | 32.8 | 24.8
Supplemental health |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 408.0 | 378.8
Capitalizations | 47.2 | 43.8
Amortization expense | (25.7) | (23.2)
End of period | 429.5 | 399.4
Medicare supplement |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 157.5 | 161.2
Capitalizations | 19.3 | 17.7
Amortization expense | (19.9) | (21.0)
End of period | 156.9 | 157.9
Long-term care |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 140.3 | 137.9
Capitalizations | 16.2 | 11.3
Amortization expense | (11.0) | (11.5)
End of period | 145.5 | 137.7
Interest-sensitive life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 234.5 | 212.2
Capitalizations | 28.0 | 27.5
Amortization expense | (11.6) | (10.7)
End of period | 250.9 | 229.0
Traditional life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 471.9 | 409.1
Capitalizations | 88.1 | 86.9
Amortization expense | (44.3) | (37.9)
End of period | 515.7 | 458.1
Funding agreements |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 4.5 | 6.0
Capitalizations | 5.5 | 0.0
Amortization expense | (1.5) | (1.2)
End of period | $ 8.5 | $ 4.8

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