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INVESTMENTS - SCHEDULE OF STRUCTURED SECURITIES (Details) $ in Millions | Dec. 31, 2024 USD ($)
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Structured Securities [Line Items] |
Amortized cost | $ 7,425.0
Estimated fair value, Amount | $ 7,089.3
Estimated fair value, Percent of fixed maturities | 31.00%
Asset-backed securities |
Structured Securities [Line Items] |
Amortized cost | $ 1,574.6
Estimated fair value, Amount | $ 1,516.4
Estimated fair value, Percent of fixed maturities | 6.60%
Agency residential mortgage-backed securities |
Structured Securities [Line Items] |
Amortized cost | $ 819.8
Estimated fair value, Amount | $ 819.6
Estimated fair value, Percent of fixed maturities | 3.60%
Non-agency residential mortgage-backed securities |
Structured Securities [Line Items] |
Amortized cost | $ 1,636.3
Estimated fair value, Amount | $ 1,539.1
Estimated fair value, Percent of fixed maturities | 6.70%
Collateralized loan obligations |
Structured Securities [Line Items] |
Amortized cost | $ 1,015.2
Estimated fair value, Amount | $ 1,016.8
Estimated fair value, Percent of fixed maturities | 4.50%
Commercial mortgage-backed securities |
Structured Securities [Line Items] |
Amortized cost | $ 2,379.1
Estimated fair value, Amount | $ 2,197.4
Estimated fair value, Percent of fixed maturities | 9.60%

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